Supermarket fuels

iaind said:
Yes it is.

You always hear people saying how the lorries leave the same depots so must be delivering the same fuel. The reality is that the base fuel is the same but modern fuels also have a lot of different additives - this is where the difference is. In the same way that shell fuel and esso fuel are different.
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Additives are different but do they make any difference? Where are the numbers? Anything factual the fuel companies claim normally earns them a slap on the wrists from the ASA when they can't prove it.

If there was solid evidence they made a big difference in pretty sure we'd be told about it in giant letters, not this "your engine may run cleaner, effects may vary" stock line. There's more marketing than science.
 
Havana_UK said:
I've run everything from supermarket 95 RON, momentum 99, branded 95 RON, V Power and BP ultimate in the M135i and frankly I couldn't tell the difference at all, either in performance or MPG.

I run a tank of higher RON through it when there's a good price, and in France over the 2500 miles I did it was exclusively on 97/98 RON because it's relatively so cheap it would be rude not to.
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I agree in general day to day and your "average" car whatever that is, you wouldn't notice difference apart from that E85 filth in Europe.

However, in highly tuned cars, especially Turbo's and Supercharged, I believe that not only would you notice but the Dyno does as well. However, needs to be mapped to make the best of it.

I assume it's a similar thing to LPG, I run LPG on two of my motors, and there is a difference in power 100%... how much I don't know, and never dynoed them to find out, however, there is a difference.
 
The girlfriends parents have several MK3 Mondeo TDCi's some with lower mileage than mine & some with higher but they always use Tesco fuel because it's cheaper whereas I stick shell V-Power in mine as the price difference is minimal & it's convenient as the fuel station is on my street basically.

I don't get any power or MPG advantages over the normal stuff, but what I do get is a car that has never had injector failure, whereas every single one of their cars has needed replacement injectors, some of them are on their 3rd set.

There is probably nothing in it but for a few quid a month i'll stick with the premium stuff.
 
Dogbreath said:
Wait, your car requires 98 octane fuel, but because you don't like supermarket fuel you'll only use their 95 octane? That makes as much sense as religion.
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No, there's 2 Asda petrol stations on my typical routes, one doesn't even have a premium unleaded pump. I've never used supermarket premium unleaded fuel before(I stick to branded) so I'm not sure of the quality and I've also never had an issue running regular 95 in my previous TFSI engines when I was desperate to fill up which meant I never seen an issue using it in this one.

It says 91/92 minimum on the filler cap, I'm sure with a recommended 98.
 
shifty_uk said:
No, there's 2 Asda petrol stations on my typical routes, one doesn't even have a premium unleaded pump. I've never used supermarket premium unleaded fuel before(I stick to branded) so I'm not sure of the quality and I've also never had an issue running regular 95 in my previous TFSI engines when I was desperate to fill up which meant I never seen an issue using it in this one.

It says 91/92 minimum on the filler cap, I'm sure with a recommended 98.
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The only supermarket that does premium is Tesco.
 
I use momentum in my Celica no problems. This is a car that is mapped for Japanese fuel. I topped it up with 95 once at a track day as momentum wasn't available. I then started getting fuel cut. That was the last time I ever put 95 in it. Now carry jerry cans to venue instead.

My Saab runs fine on 95 but you can feel reduced power so just run it on 99 now (Trionic reduces power to prevent knock on lower octane fuel). After all petrol is so cheap now it doesn't really matter!
 
adam cool dude said:
I use momentum in my Celica no problems. This is a car that is mapped for Japanese fuel. I topped it up with 95 once at a track day as momentum wasn't available. I then started getting fuel cut. That was the last time I ever put 95 in it. Now carry jerry cans to venue instead.

My Saab runs fine on 95 but you can feel reduced power so just run it on 99 now (Trionic reduces power to prevent knock on lower octane fuel). After all petrol is so cheap now it doesn't really matter!
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Petrol is cheap now? Really? :p
 
Minstadave said:
Got any data? I'm amazed that if there's solid proof of benefit it's not plastered all over the place.
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Take any car on the market, especially a turbo/supercharged one and map it on Supermarket 95RON and Dyno it then fill it with 98/99RON, map it again and Dyno it, you'll see more power and torque through the entire rev range with higher octane as it's got higher knock resistance
 
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My 330i runs better on shell nitro and regular shell. Seems to feel that it lacks performance on supermarket, or any other fuel from other petrol stations.
 
Frozennova said:
Take any car on the market, especially a turbo/supercharged one and map it on Supermarket 95RON and Dyno it then fill it with 98/99RON and Dyno it, you'll see more power and torque through the entire rev range with higher octane as it's got higher knock resistance
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If it is mapped to suit 95 then how exactly will higher RON increase power/torque?
 
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