Right lads i know what im talking about here, after spending 5 years working for shell, this isnt a biased oppinion its fact, companies like shell and bp use additives in their fuel which keep your engine components cleaner, less carbon deposits etc, shell have just bought out fuel save fuel which goes further too. Ive monitored mpg and good fuel goes further and is better for the life of your engine. performanc fuel like v-power (shell) does have a diffrence on the performance of my bm too....... but it is very expensive B)