does anyone know what fuel is used by supermarkets ie tescos/ sainsburys the reason i ask is a guy at my wifes workplace reckons he gets more milage from using shell/bp etc rather than using the supermarket stuff and says its common knowledge 
and says its common knowledge![]()
Every little helps Tesco's profits

That may be so, Woody, but according to Honest John additives are supplied subsequently:It comes out of the same tank at Milford Haven![]()
Can't envisage too many punters demanding documentary proof that their 12 gals of Asda'a finest contains the latest additives, can you?Shell Optimax 98Ron was the best petrol, giving better performance and economy for most (though not all) cars. This has now been replaced by Shell V-Power 99Ron part bioethanol which is even better. Shell and Texaco petrol traditionally had the best detergent packages, but BP Ultimate petrol now has a good one too, and Esso has also introduced a high detergent petrol. Lack of detergent and a high proportion of short runs from cold is what causes most petrol engine fuel system problems, so if you buy your petrol from a supermarket seek written assurance that it at least meets and preferably far exceeds the British Standard for detergent in petrol.
So with the high octane fuels its just additives that are mixed with the petrol after it comes out the same tap?
Buy a diesel car. It'll run on anything. Bullet proof.![]()
Don't tell em all Steve! If they all go for diesel the price will go up. Stay with your petrol cars folks - 22mpg is fine for you lot!Buy a diesel car. It'll run on anything. Bullet proof.![]()