13.09.06 Asda cuts unleaded to 87.9p

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110 comments 634 votes

Do you think supermarket fuel is lower quality than branded fuel (e.g. Shell or BP)?
Thanks fo Matt who pointed out that Asda has dropped its fuel price today.
  • Unleaded: 87.9p
  • Diesel: 92.9p
Note that diesel is still quite high so you might be able to find cheaper. Go to our home page and do a search in your area.

A good point was made by Richard W that the main reason that pump prices are falling is because the oil price has been falling for the last few weeks. The oil price has a nasty habit of going up though, so don't get used to falling prices.

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The decline in the price of Crude Oil is begining to stall.

Here's how Asda do it.
Non- Refiner: Spt 13th Price.

Pump Price 87.90p/litre.

Duty/Vat = 60.19p/litre/68.48%.
Company = 27.71p/litre/31.52%.
Petrol = 22.21p/litre/25.27%.
Gate/Del = 01.25p/litre/01.42%.
Profit = 04.25p/litre/04.85%.

The Petrol Price is "Finished Product" minus additives.
The Gate/Del Price is the bare minimum for additives to the Fuel.

Posted by Learjet, 13th September 2006 7:02pm

This comment has been removed as it was found to be in breach of our Blog Policies.

As a resident of the Isle of Man,paying 97.9p for unleaded(no competition),it is very interesting to note the prices being charged on the mainland.
The site is vey useful when travelling off Island to establish the cheapest fuel when leaving the Ferry at either Heysham or Liverpool.My vehicle leaves the Island with as little fuel as possible and returns with as much as possible.

Posted by Allan Blackburn, 14th September 2006 11:06am

I work in chesterfield and the fuel price in morrisons staveley is now 87.9p,though it shows 88.9p here. Just incase they're people close by than going to sainsbury which is still on 88.9p.

Posted by Jerry Andrews, 14th September 2006 2:53pm

It's a pity that Asda don't follow suit with their rivals Tesco and Sainsburys and run a promotion of 5p off a litre for spending £50 or more in the store!
I shop at Asda as they are cheaper for their food but unlike the other giant stores, we never get anything in return from Asda which will benefit the motorists:-(

Just think... If Asda were to do a similar promotion on their fuel, we could get Unleaded petrol for 82.9p a litre. Wow!! What a saving that would be!!

Posted by Alec Scott, 14th September 2006 4:26pm

I'm apathetic and English, so I won't rock the boat. I just pay through the nose.

Posted by Glyn Ellis, 14th September 2006 5:27pm

I notice that Sainsburys doesn't show up as 92.9p for diesel any more. Have they actually put the price up again?

Posted by Ian Keiller, 14th September 2006 5:50pm

Sainsbury's 87.9 unleaded and 92.9 diesel nationally. For some reason their prices don't show at all in the petrolprices.com website

Posted by Matt, 14th September 2006 8:51pm

This comment has been removed as it was found to be in breach of our Blog Policies.

This comment has been removed as it was found to be in breach of our Blog Policies.

Supermarkets cut prices again
Published: 14 September, 2006
The big four supermarkets have continued to cut their fuel prices.

Asda, Morrisons and Sainsbury are currently selling unleaded at 87.9ppl and diesel at 92.9ppl on all their sites nationwide as oil prices have dipped to a seven-month low. Meanwhile Tesco has announced it is dropping its unleaded price by another 1ppl, although its sites are priced locally.

Posted by Matt, 14th September 2006 9:14pm

I have been surprised that the fuel prices for GU18 have been so out of date recently. Sainsburys at Brookwood have not been mentioned although they are cheaper than the other 5 petrol stations listed for cheap fuel in my area.
Thursday 14th Sept.

Posted by David Saunders, 14th September 2006 9:21pm

I shop at Asda as they are cheaper for their food but unlike the other giant stores, we never get anything in return from Asda which will benefit the motorists:-(

Many people fall for the Adverts claiming Asda as the lowest priced supermarket, however if you shop in Aldi or Lidl you will find this to be a myth. Apon initial comparrison you may not see this but "like for like" must be used. For example : a basic brand of meat pie in Asda will have as little as 35% meat content, whereas (by law in their native country) the Aldi/Lidl ones will contain 75% !!

Posted by Timothy Ford, 14th September 2006 11:11pm

If you sign up for an Asda credit card you will get 2p off each leter from the posted pump prices when you use thier credit card this lsats for 1 year.

Posted by Gordon Tucker, 14th September 2006 11:20pm

As has been mentioned before on these forums, the quality of the diesel from the supermarkets isn't that great. My MPG was really suffering.

Luckily where i am (Wakefield) the Shell garage is offering diesel at the same prices as the supermarkets and i'm getting upwards of 80 miles extra per tank. And considering I am doing 600 miles per week, this makes for quite a saving.

Posted by Stephen W, 15th September 2006 11:10am

Hi all, I am changing my car next month to diesel, can some one with "know" tell me why Diesel is now some much more expensive the petrol. I think not so long ago it was only about 1p-2p more a litre. Why isnt it coming down in line with petrol??

Posted by Alan Clarke, 15th September 2006 2:59pm

This comment has been removed as it was found to be in breach of our Blog Policies.

Ref : comments from Stephen W
I find your variation in MPG figures highly dubious as I have bought from Jet, Shell, BP, Esso, Morrison, Asda, Sainsbury's and Tesco. I check my consumption every time I fill up and the only time I notice any difference is because my mileage has included more motorway driving and has nothing to do with the petrol station.
I strongly reccomend that you re check your figures allowing for the dozen or so different factors that can effect your fuel consumption (the aircon on my nissan wipes 7mpg off straight away!) All low sulpher fuels contain surfactants but only super unleaded has anything in it to improve fuel economy. This information is correct as my father worked for R@D at BP for over 30 years !

Posted by Timothy Ford, 15th September 2006 8:19pm

im pretty happy too, as i run a 95 subaru impreza wrx (which to those in the know is a japanese import). all japanese imports need to be run on very high octane fuel say 99ron or over as japans general octane rating is 100-101 ron, so its nice to see that in the space of 5 weeks my local tesco in scunthorpe has redused tesco99 s.u.l. from 103.9p to 91.9p a litre. for a car like mine that will generally do 22mpg thats a lot of difference when your putting upwards of 40 litres in a week at a saving of 11/12p a litre. im not complaining about my car being thirsty (or i wouldnt have bought it) im prasing the fact the cost of the fuel is decreasing and not the fact my car drinks petrol like an acholic drinks... erm... alcohol.

Posted by Andy Hart, 15th September 2006 11:07pm

At the present time the "demand" for Diesel is high, mostly from Industry stockpiling for the coming winter. Europe and the UK are more "distillate" minded than the US. Coming off high prices, the Diesel price decline has been slower than Petrol, but is slowly catching up.

One thing to remember is that "sulpher free" is on the way "less than 10ppm" in the UK and Europe. Less than 15ppm in the US. It is available in the UK at present, but becomes obligatory January 1st 2008.

This will affect prices in the future, if not before.

Posted by Learjet, 16th September 2006 3:24am

I cannot understand how your site has suddenly stopped recognising garages in my area. When I type in my postcode, it claims there are no garages within miles and is completely ignoring ALL Tesco stores.

Posted by Andy, 16th September 2006 5:32am

I ask for garages selling unleaded within 10 miles of Neport (Gwent) and although there are 2 Tescso,2 Sainsburys,2 Asdas and 1 Morrisons these do not come up on a search!

Posted by John, 16th September 2006 8:56am

#17, same too for Bournemouth, and my postcode BH8.

Posted by Phil, 16th September 2006 10:03am

Looks like the site is experiencing problems. When I do a search today all I get is a BP garage within 5 miles of me (94.9 for diesel). I know something must be wrong as BP is nearly always the most expensive!

Posted by Ian, 16th September 2006 10:14am

I too am only getting BP stations come up on the cheapest Unleaded petrol prices within 5 miles. Like Ian's comment is there a problem with the site?

Posted by Sheelagh Mathieu, 16th September 2006 12:28pm

I do believe your site has fallen prey to a bug, old chap. All cheapest stations are omitted and a price of 99.9 has come up as one of the cheapest for unleaded in my area... which isn't true.

Posted by Spencer Barley, 16th September 2006 12:39pm

From this morning Sainsbury's have lowered to 86.9 for Unleaded and 91.9 for Diesel.

Posted by Matt, 16th September 2006 6:15pm

Definitely a problem with the site at the mo.
Here in Suffolk, Sainsburys Unleaded was 86.9p per litre today (the cheapest in 14 months). Diesel is 91.9p. Normally Suffolk prices are around average for the UK.

Let's hope the price decreases continue and that the glitches on this excellent site are put right soon.

Posted by Mike Reid, 16th September 2006 6:39pm

I normally fill up in Stamford, Lincs, but cannot find it using either the name or PE9 - the Postcode. Why is this please?

Posted by Peter Shepperd, 16th September 2006 10:58pm

Definitely a problem, half the garages in my area LE10 have disapeared. and the ones that are there are saying 92.9 for unleaded???

Posted by Ian Grice, 17th September 2006 3:44am

Something definitely up with your site- all the 'supermarket' sites have indeed gone from the screen and only oil company brands are listed, making it wildly inaccurate for most of the Black Country.

I am grateful to Spencer Barley and to Matt for their news about Sainsbury's being 86.9.

Meanwhile- have you been 'blacklisted' by the supermarkets, guys??

Posted by Paul Sandars, 17th September 2006 10:02am

Hi guys!

Yes our local Sainsburys in Bournemouth has dropped its prices again on all grades! They are:-

Unleaded 86.9p
Diesel 91.9p
Super Unleaded 88.9p
LRP 88.9p

All prices are per litre!

Posted by Alec Scott, 17th September 2006 10:21am

Sainsbury's are down to 86.9 litre in Edinburgh

Posted by Fox1, 17th September 2006 10:59am

If sainsburys can sell petrol at 86.9 pence a litre and still make a profit why can't all the other garages all i can think of is shear greed by the independent owners if you charge 1p a litre less than every one else it is simple you will sell 4 times the fuel so you will make 4 times the profit because you will get 4 times the customers after all we are all intrested in price so the cheaper your petrol the more customers and the more profit you make

Posted by Nightflyer, 17th September 2006 2:26pm

My local Sainsburys is 86.9, dropped again. 3 local Tesco's (within 5 miles) don't appear to be reducing prices much, nothing like sainsburys, asda & morrisons

Posted by John Smith, 17th September 2006 3:28pm

Sainsburys in Dewsbury is selling diesel at 91.9p per litre

Posted by Michael Street, 17th September 2006 6:39pm

Sainsburys diesel is 91.9p here in Aberdeen today. Asda is 92.9p

Posted by Anne Reid, 17th September 2006 6:54pm

I think out of all the supermarket, Sainsburys sells the best fuel as they get the supplies from the bp.

Posted by A Han, 18th September 2006 12:11am

Re comments from Timothy Ford.

Thankyou for your concern in how i read my odomoeter, but i can assure you my MPG has increased since using Shell fuel.

I do 95 % motorway driving and have noted a marked difference in performance.

I don't have air con, my tyres are always at correct psi - i check these factors regularly because of the amount of miles i do a month. The only thing i have changed is my fuel.

I stand by my comment, although some people seem fit to want it removed

Posted by Stephen W, 18th September 2006 9:15am

In line with Stephen W's comments about the quality of diesel at supermarket stations, can these comments be attributed to the unleaded petrol they sell?

I ask as I have made the same journeys with a supermarket-brand as a named brand, & with all things being equal (ie. air-con not on, correct psi on tyres, same mph, etc), I've noticed that my car appears to consume the supermarket-brand too a significantly higher degree than the named brand.

Posted by Ajay Mistry, 18th September 2006 10:22am

Ajay,

After reading your comment, I would certainly say that Stephen W' comments apply to supermarket unleaded fuel. I have used Tesco unleaded in three different cars all of different ages and all three made by different manufacturers and they all used the Tesco fuel considerably faster than Shell or Esso fuel. I also found that all three cars didn't run as well as normal either, with all their engines feeling lumpy and rougher than normal.

I have used Sainsbury's fuel without noticing much difference but their fuel is supposedly supplied by BP and as a result is probably as good as any other but Tesco fuel appears to be poor and I have no plans to use it again unless desparate.

Posted by Peter M, 18th September 2006 11:02am

Sorry, Tim Ford, but I have to agree with Stephen, Ajay and Peter. I drive about 50-60,000 miles a year, mainly on motorways (Automatic 2.2l with aircon), and there is a marked difference in MPG between Shell/BP and the supermarkets. I also agree Tesco's seems to be by far the worst. I can often get an extra 100+ miles out of a (70l) tank if I have not used Tesco fuel. Using the aircon has a much smaller impact on my fuel consumption.

However, I have failed to get anything like BPs claimed extra mileage when trying Ultimate, so I just don't bother with it, since the difference in cost means I'm a lot worse off. I just stick to ordinary cooking unleaded.

By the way, I have averaged 31mpg over the last 120000miles. Before that I had the manual box and averaged 35mpg. So the auto box is the biggest guzzler!

Posted by Nigel Lusby, 18th September 2006 1:53pm

I work for Sainsbury's and yes, all of our fuel is supplied by BP, quite often in BP branded tankers so it's no secret. It makes me wonder how much profit BP makes at their branded stations as they must be supplying to Sainsbury at a profit, which then sells at 86.9 unleaded and 91.9 diesel.

Posted by Anon, 18th September 2006 5:27pm

I normally find that Asda's does tend to offer the better deal's when it comes to most things.
Today, I found that the Asda's in our area have just lowered their petrol down to 85.9 for unleaded, once again being the lowest in town (as far as I can find anyway).

Posted by Alain Russell, 19th September 2006 10:02am

Thanks for all the points in this thread.

It is a pity that it is not possible to find out where the cheapest garage is each day in the UK.

I will also take the points about Tesco into mind - I have a 5p off per litre, so will probably use this - then consider switching to Sainsbury's for fuel - or using the Shell opposite, which is always inline with Sainsbury's price.

Posted by Ian, 19th September 2006 1:29pm

In West Midland area's: Sainsbury's and Tesco continue to do battle, both at 86.90p/litre Unleaded 95, and 91.90p/litre Diesel.

However "Market Fuel Prices" are either stalling or begining to reverse direction.

Posted by Learjet, 19th September 2006 1:59pm

Adsa have dropped the price of Unleaded to 85.9p per litre, Diesel at 91.9p per litre, and Auto Gas is at 39.9p per litre hopefully will keep coming down.

Posted by Barry Gilfillan, 19th September 2006 3:27pm

Why is that on the home page it says that the lowest priced petrol station is selling unleaded at 85.0p a litre, while there is a station in the London, Kent area selling unleaded at 83.3p a litre. I dont know if this is a mistake as i dont live in that area to see it in person, i was just typing in locations to see who had the cheapest petrol and came accross this.
Petrol stations still at 87.9 in the llanelli, carmarthen area which include a tesco and morrisons but no asda and sainsburys.

Posted by Phillip, 19th September 2006 7:12pm

Oil markets are again tumbling - with hedge funds unwinding more of their speculative positions after Bush's mild comments regarding Iran.
With sterling also strong against the dollar, if the oil marklets do not rebound then expect to see further falls at the pumps.

Posted by Ian, 19th September 2006 8:19pm

ASDA have just lowered Unleaded to 85.9p Litre in Queensferry, Flintshire

Posted by Phil Bennett, 20th September 2006 7:01am

So at Asda there is now a 6p difference between unleaded and diesel. Last time unleaded was this low we were paying around 88.9 for diesel, so what's happened? Why is the price war not extending to diesel?

Posted by Matt, 20th September 2006 3:41pm

Diesel ought to catch up, and my guess is it will end up about 3-4p more expensive than unleaded. Gasoline was the first and fastest faller in the traded market, but diesel is now following suit. Pump prices seem to move 2-3 weeks behind market prices, and given the market prices at the moment, expect further noticeable falls at the pumps - unless the traded market rebounds significantly.

Posted by Ian, 20th September 2006 4:26pm

Hi,

I have gone past quite a few stations in the Swansea area today, and most are selling at 86.9p for Unleaded and 91.9p for diesel.

Posted by Craig, 20th September 2006 4:44pm

In the Dudley area of the West Midlands. Asda, BP and Tesco are now doing battle at 85.90p/litre for Unleaded 95. Cheapest Diesel remains 91.90p/litre.

"Retail" spread between the two fuels is now 6p/litre.

"Market" spread is 4.50p/litre. Draw your own conclusions.

Posted by Learjet, 21st September 2006 11:53am

Learjet has hit the nail on the head, why such a hugh price diefference, whats has changed to cause this, the popularity of diesels, and this sh*ty governments stance on diesels.

Posted by Bungle Bear, 21st September 2006 12:54pm

Re point 30, its because tesco offering 5ppl discount if you spend over £50.

Posted by Zippy, 21st September 2006 12:56pm

Tesco and Asda neck and neck in the Black Country at 85.9 for Unleaded.

I read somewhere that whilst Asda and Sainsbury's change their prices on a national directive, Tesco store managers have local discretion, but are expected to be the lowest or equal lowest Unleaded in a 5 mile radius of their store in question.

Is that so? It appears to be the case around here.

Posted by Colonel, 21st September 2006 4:15pm

Got to agree on Diesel prices - I am sure that diesel used to be cheaper than unleaded!!

Hopefully the 5 or 6p per litre will reduce.

Where does the price of Premium Diesel come from - this seems to be another 7p on top of diesel. Ever since the fire in Hertfordshire Total have scrapped their premium diesel, which means that BP have no real competition. Total's price was always within a couple of pence or standard diesel.

According to the BBC site oil fell again today and is now around $59 - who wants to bet that the government will now impose their tax increases that they put on hold??

Posted by Ian, 21st September 2006 10:44pm

I can honestly say I have never found a difarence in supermarket fuel and named brands, be it unleaded or derv no mater what car I have driven.

Posted by Ian Grice, 22nd September 2006 1:38am

in relation to points 35,36,37,38. i have a 2ltr rover 600 powered by a honda engine i used tesco fuel for approx 9 months and found towards the end my car run worse and worse then i switched to bp and within a couple of fills found i was getting better fuel consuption and increased power. by the way i always fill my tank as far as possible and a little bit more i found that this would give me increased mpg.

Posted by Andrew Scott, 22nd September 2006 2:46am

Regarding BP's Premium Diesel... in my area (SE England), BP is never the cheapest for regular diesel anyway (just did a 20 mile search and no sign of BP), so I always avoid of BP unless I'm desperate.
I remember a news report a few months ago then mentioned BP's fuel tended to be more expensive than their competitors' and when asked a company spokesman said 'we don't comment on our pricing'.

Some Shell garages (often on the Petrolprices radar) have 'Diesel Extra', some don't. Does anyone know if that's being phased out or if it's any different?

Posted by Iank, 22nd September 2006 11:05am

I have heard it stated that diesel sold by supermarkets is of poorer quality IE having considerably larger persentages of water content.
My Soninlaw who records his milage tells me that he gets a higher MPG from diesel purchased from BP and Shell stations !!!!!!!!!!!!

Regards,
John.

Posted by John Dale, 22nd September 2006 11:59am

In the West Midlands area, "Shell" have now joined the battle along with BP, Tesco and Asda. Unleaded 95 @ 85.90p/litre. Diesel @ 91.90p/litre.

The National Avg for Unleaded 95 is 89.30p/litre. Diesel 94.30p/litre.
The spread between the two fuels is 5.00p/litre.

In the "cut-price" market the same spread is 6.00p/litre. Which may give you a clue to what's actually going on.

Posted by Learjet, 22nd September 2006 12:29pm

Re post 58, supermarket is not poorer quality, how does it meet the same standard!!!!!.
Higher percentages of water, total rubbish.

Posted by Stuart, 22nd September 2006 3:54pm

ASDA today (25 September 2006) announced it is cutting fuel prices again, for the fifth time in as many weeks and setting new lower pump prices at all of its 167 petrol stations across Great Britain and Northern Ireland from tomorrow morning.

ASDA's new national fuel prices will see unleaded petrol drop by another 1p to 84.9 pence per litre with diesel falling by 2p to 89.9 pence per litre at all its forecourts.

Unlike other retailers ASDA's national fuel prices mean that motorists filling up at the pumps don't pay a premium if there is no competition in the area.

This follows on from the supermarket's price drop last week. This latest cut sees unleaded petrol pump prices drop to their lowest since June 2005.

Unleaded has now fallen by 13 pence per litre since the beginning of August.

Further falls in the cost of petrol are enabling ASDA to pass on these cost savings to its customers.

To make sure all its customers benefit from the lower costs, ASDA has once again reduced the prices at all its forecourts to the same level, irrespective of where customers live and the prices set by local competitors.

On top of this price reduction, all ASDA credit and store cardholders are currently entitled to a further two pence per litre of fuel discount when paying with their card.

ASDA trading director, Andy Brem, said: "At ASDA unlike other retailers, you pay exactly the same price for your fuel wherever you fill up at the pumps. The latest price cut is a further example of ASDA making motoring more affordable, it's our fifth move in as many weeks and illustrates our commitment to passing on cost savings to our customers."

Posted by Asda Rules, 25th September 2006 2:34pm

Until about three months ago I was a regular customer at our local Tesco petrol station. Whilst on a run one day I needed to fill up with (unleaded) fuel and did so at a Morrisons Supermarket station. I found that I was getting a far better mpg rate than at my previous supplier. I repeated the exercise several times over the coming months and the results were confirmed. I am a regular commuter only using my vehicle, a "P" registered Mitsubishi Carisma 1.6, to travel to and from work and the occasional run so the conditions were similar during the use of both sources of fuel. has anyone else noticed this disparity? It would be interesting to find out.

Posted by Ward Locke, 25th September 2006 3:59pm

Well done to Asda for cutting prices again.
My local Tesco is STILL 94.9 for Diesel, and 92.9 for unleaded. It's funny that an Esso garage about 200yds from Tesco is cheaper on both grades by 2p and usually always is, I can't believe that people use Tesco

Posted by Matt, 25th September 2006 5:29pm

Ref supermarket fuel vs BP/Shell etc
The mpg indicator in my 18 month old Nissan is accurate to +/- 1% but is always cosistent so maybe someone can explain why it recorded 78 mpg at a steady 65 mph and then recorded 76 at the same speed, both times I had filled up with Shell diesel !!! On the first journey I was carrying extra weight too !!
I am begining to wonder if those people who get an amazing 100 more miles to a tankfull should check their odometres. Diesel is diesel, it has NOTHING added to it to make it better at one forecourt than another and water does not make it less affective as the two seperate in the tank !! Re- check your figures !!!!!!

Posted by Timothy Ford, 25th September 2006 9:57pm

Comment 38
Nigel, if you would care to look at the articles I was commenting on Diesel not Unleaded, it is a well known fact that Unleaded varies.
To maintain accuracy with comments please read articles carefully.

Posted by Timothy Ford, 25th September 2006 10:06pm

Sorry to go on about this subject but below is what I would consider the definitive answer as it is provided by Fleet News : who better to have the knowledge to provide the answer.

Earlier this month from Fleet News:

"One driver has complained that the supermarket fuel is poor quality, has low detergent content and if used frequently leads to breakdowns, which in a diesel car means a new fuel pump! Is this correct?

Answer: "Basically, all fuel retailed in the UK must meet certain standards. There are British Standard definitions for every fuel type and quality, usually marked clearly on the pump.

"It is also well-known that most supplies to forecourts are blends from 'the local refinery'. While these are branded, there is a huge amount of cross-branding of the same chemical mix, with some additives mixed in, late in the process (often in the tanker itself) to support product differentiation.

"In my view, the overall level of fuel quality from UK forecourts is high and pretty uniform. It is not generally true that 'supermarket fuel is very poor quality' - much of it is almost the same as the branded liquids with the oil-company names."

Note the fact that supermarket fuel "must meet certain (BS)standards" and that much of it is "almost the same as the branded liquids".

Lastly I live in Scotland which is supplied by Grangemouth which is of course BP !! (and yes that does mean that you might be filling up with BP in a Tescos or even a Shell garage !!!!!!)

Posted by Timothy Ford, 26th September 2006 2:21am

Re Timothy - Post 66

I don't understand why you can't accept that people are getting better performance from branded fuel.

I can state, hand on heart, that my MPG has improved since i switched to using Shell as opposed to Morrisons brand. I have no agenda here, i am stating what i know to be true in my experience

Also, 'almost the same' doesn't mean it is the same, hence the 'almost' part. This is what could differentiate in performance for some people out there.

Posted by Stephen W, 26th September 2006 2:00pm

Shell is still charging 94.9p a litre for Diesel around here, and they can because they have no competition. The nearest Asda is a 30 mile round trip away so negating any reasonable savings on the extra journey expense.

A trip to Whitby at the Weekened revealed prices still around 96p/ltr in some areas.

I used to defend the fuel companies when they came under attack because of the price of fuel, as the majority of the fuel price was and still is tax, however when the wholesale price of oil does fall, there are always a few big companies in monopoly areas who are seemingly slow to reduce the price to the end user, so i'm now revising this loyalty.

Posted by Diggity, 26th September 2006 3:28pm

Diesel sold at all forecourts is EN590 standard. I *think* I have achieved slightly better mpg using Shell than others but not so much I'm convinced.
My mpg varies (in my Merc E320CDI) greatly depending on driving style and road conditions. I regularly travel from SE England to Cumbria, and get between 40-45 mpg. The difference between a headwind and a tailwind can make 5 mpg difference in my experience.
I'll fill up at Asda's in Carlisle tomorrow, I think!

Posted by Iank, 26th September 2006 7:27pm

have read with interest several comments about varying mpgs achieved from different sources of fuel. Many of them are relevant but I have not seen mentioned one of the commonest reasons.

A state of affairs exists in the oil distribution industry whereby the amount of fuel delivered into the motorist's tank can vary depending on where and when he buys the fuel.
This is despite stringent regulations on the measuring systems of forecourt fuel dispensing equipment and regular checking by Trading Standards departments.

New product leaves the refining process at a very high temperature (that is how petrol and derv is distilled) and is stored in large tanks for onward distribution. The heat in this product dissipates quite slowly as the tanks hold millions of litres. When the product is later moved to other, more local, distribution depots the act of transportation and the time delay ensures that the fuel falls to the local ambient air temperature by the time it reaches the retail customer.

However, depending on where the petrol station is situated, it is not uncommon for the product to reach the retailer directly from the refinery and for the product to be still hot when it goes into the petrol station's tanks. This can happen in areas upto a 100 miles or more radius around the big refineries like Stanlow, Grangemouth, Immingham, Fawley, Milford Haven, Coryton etc.

Once the product rests in the underground tank of the retailer, the surrounding soil will slowly absorb the heat and the retailer experiences product shrinkage - that is to say, that the product contracts and the retailer loses a proportion of the volume of stock he has bought. It is only in the last 10 years or so that the oil companies have been forced to acknowledge this truth and now product from hot sources is sold to the retailer at a notional average ambient temperature (15 degrees if my memory serves me) and the retailer is compensated on a sliding scale for the anticipated lost volume should the tanker be loaded at the refinery with product at a higher temperature. The higher the loading temperature, the more the retailer is compensated.

Now, if the unfortunate motorist goes into a petrol station on a cold winter morning where there has been a dellivery in the past few hours and it has come from a hot (refinery) source then, even though the pump may register 30 litres, by the time the customer has travelled a few miles and the cold air has whistled round the underside of the car, that 30 litres will have shrunk, thereby effectively reducing the resulting mpg.

The shrinkage below forecourts is sufficient for retailers to have brought a test case some years ago claiming considerable compensation from one or more of the major oil companies and for them to have won the case and forced the oil companies to change their practices and pay compensation for stock-loss on hot product. Stock-losses valued at several thousand pounds per annum were recorded by some retailers who brought the court case


Further difficulties in making direct comparisons of mpg lie in the fact that due to logistics a petrol station may receive hot product on one delivery and cold product the next time because the product has been sourced from different locations. For example, a delivery tanker working in South Wales might source its first delivery from Milford Haven (hot product from a refinery) and then its second load from Avonmouth (cold product, produced weeks ago) so, depending on the time of day, the same petrol station can get product at different temperatures.

You might think that the Trading Standards authorities should investigate this. They are aware of the problem because they were the first port of call of the retailers when they discovered that they were being short-changed but I understand that the authorities believe that the loss to an individual motorist is small and only affects some parts of the country (the Midlands for example have no local refineries so almost all the product sold there is cold). The necessary technology to vary the amount of delivery dependent on temperature at the forecourt pump is considered too costly to implement.

Although the loss may be small, it does affect many of you who log every milli-litre and every mile, though.

Posted by D Galpin, 26th September 2006 8:36pm

Petrol in the WN7 area has dropped again. Sainsburys is now 85.9p a litre and Asda has dropped again today to 84.9p per litre. I'm sure Sainsburys will follow suit soon.

Posted by Pamela Roberts, 26th September 2006 9:38pm
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