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Started by indlovubill on May 15, 2022 11:42:43 PM
Car Fuel Consumption.

Is there a difference between supermarket fuel and fuel bought from, for example, a Shell garage? Friend of mine insists there is, he claims the latter gives more miles per gallon. I'm going to try it on one of my regular UK trips when get back from Spain. 300 miles on supermarket fuel and 300 miles on Shell fuel.

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moto748 - 17 May 2022 13:41:08 (#1 of 20)

I say no. People were claiming similar fifty years ago. I didn't believe it then, and I don't believe it now.

FleurDuMal - 17 May 2022 14:45:39 (#2 of 20)

I wouldn't have thought so. It all has to go through a similar process (and meet certain standards) and supermarkets buy from the big fuel companies in any case.

mikeshadow - 17 May 2022 15:08:09 (#3 of 20)

I’ve never been convinced that the secret additives that the big brands say they use make much difference.

FleurDuMal - 17 May 2022 15:15:53 (#4 of 20)

Not for a bog-standard engine. I suppose if you have a Ferrari or something, it may help a bit.

Tadagee - 17 May 2022 15:41:20 (#5 of 20)

When Mrs G put petrol into our diesel the speculialist AA guy who came out said the supermarket fuel was cheaper as they didn't put in the additives used to improve performance and reduce engine wear. He said he never filled from supermarkets.

Apparently.

FleurDuMal - 17 May 2022 15:50:33 (#6 of 20)

Both my sons work in a motor-related industry and they use supermarket fuel.

Tagyourit - 17 May 2022 15:55:37 (#7 of 20)

I was advised by a mechanic to use "proper" diesel at least one out of three fills as he reckoned supermarket fuel was dirtier, not because of the fuel but the quality of the station tanks and how often they were cleaned. No idea if he was talking bollocks or not.

upgoerfive - 17 May 2022 16:49:16 (#8 of 20)

One thing that will make a (small) difference is if you fill up with E10 fuel.

That's the stuff containing 10% ethanol (it's often promoted as 'Green' fuel by BigOilCo.)

There was a big hoo-ha in the motoring press about poor fuel consumption when it was first phased in, but several different tests have shown that it is only around 1% difference.

https://en.wikipedia.org/wiki/Common_ethanol_fuel_
mixtures#E10_or_less

Verdigris - 17 May 2022 16:18:05 (#9 of 20)

There was a big hoo-ha in the motoring press about poor fuel consumption when it was first phased in, but several different tests have shown that it is only around 1% difference.



They did a test, on Fifth Gear, a year or so ago, with E10 and premium fuels and, as you say there was little consistent difference. IIRC, they came to the conclusion that a tank of premium, once in a while, might help to keep the engine cleaner, but otherwise use supermarket.

indlovubill - 25 May 2022 19:04:03 (#10 of 20)

I'm also sceptical of my friend's claims but I'll give it a try. The trial will be supermarket diesel versus Shell diesel, the ordinary stuff not the supreme or whatever they call it.

I'm waiting to hear about the fuel 'windfall' tax, not the energy company windfall but the government's windfall tax receipts on the increased price of fuel. Sunak gave us a paltry 5 pence per litre discount.

I've just been in Spain where there is a discount of 25 cents on every litre. Pump prices on the motorways are around 2 Euros per litre and the 25 cents discount is knocked off at the till. Therefore 1.75 Euros per litre which at today's exchange rate converts to roughly £1.50 per litre.

Rip off Brexit Britain.

CarlosFandango - 25 May 2022 19:30:23 (#11 of 20)

Spain has been the stand-out cheap EU country for diesel for a good few years now, in my experience.

Immediately pre-pandemic, or in JTT time, about 6 months before bill scared us all into thinking he'd carked, I paid €0.99c a litre in Salamanca.

tasselhoff - 25 May 2022 20:16:36 (#12 of 20)

France used to be great for diesel, due to some quirk of De Gaulle who wanted to use up stocks of diesel or something. IIRC it was only a couple of years ago that they pegged the tax at the same level as for petrol (this is probably why France produced great little diesels).

indlovubill - 25 May 2022 22:01:46 (#13 of 20)

Spain has been the stand-out cheap EU country for diesel for a good few years now, in my experience.

Cheapest I saw diesel off motorway was 1.84.9, 1.85 in round figures and that was before the 25 cents discount.

about 6 months before bill scared us all into thinking he'd carked,

Sorry about that though it was unintentional, Carlos.

CarlosFandango - 25 May 2022 22:52:02 (#14 of 20)

Well it was good to see you back, reinvigorated and as salty as ever.

I drove back from Brussels via Calais two days ago and almost made it home without needing to top-up. Little yellow light came on a wee bit early for comfort so was forced to nip into the M40 services near Bicester.

Don't ever go there - price was £1.99 a litre, which is 26p more than my cheapest local. I put a tenner's worth in, which got me a fraction more than a gallon.

Verdigris - 26 May 2022 09:00:24 (#15 of 20)

I stared in wonder horror at the £2/litre diesel sign at Sedgemoor Services, the other day. I can recommend the Murco/Nisa garage, between Lampeter and Pumsaint; £1.78/litre and the nice lady brought out a watering can so we could fill up the washer bottle, as they only sold concentrated screenwash.

indlovubill - 26 May 2022 12:59:04 (#16 of 20)

Learned a bit about hybrids when I was in Spain this time. First time I've had a hybrid hire car and did about 1500km on the motorways getting around 6 litres per 100km, mostly sticking to the 120 kmph speed limit. Yesterday though in 60 km of rush hour stop start traffic it returned 4.7 litres per 100km. Explains why taxi drivers get incredible mpg out of a Toyota Prius, the most popular taxi driver choice around home in the UK.

thisonehasalittlehat - 26 May 2022 13:13:31 (#17 of 20)

Obviously if you're not braking much they're not recovering much energy.

indlovubill - 26 May 2022 13:27:11 (#18 of 20)

You're spot on there, hatters though prior to actually driving a hybrid something that I hadn't previously considered.

Verdigris - 26 May 2022 12:42:59 (#19 of 20)

Obviously if you're not braking much they're not recovering much energy.



You don't need to apply the brakes to get energy back. Just backing off the accelerator will turn excess kinetic energy into electricity. If you have the regeneration set to "one pedal" you don't need to apply the brakes at all (except in an emergency).

indlovubill - 26 May 2022 13:55:58 (#20 of 20)

You don't need to apply the brakes to get energy back. Just backing off the accelerator will turn excess kinetic energy into electricity.

Not much just from backing off the accelerator, a lot more from braking. There was a gauge showing how much, though just in terms of thin line/thick line.

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