Shell V-power is the new name for the "optimax". I think its a RON99 fuel. Whereas your average asda/tesco fuel is about 95/96 RON. Basically the higher the RON rating, the better the fuel.With more octane and additives that
help clean your engine. It also helps the performance a bit. Nothing major, but I definitely CAN tell the difference on my 16v. It also slightly helps improve the MPG. The only price for all this is.........the price.
p.s you wont tell any difference if you put a £10 worth in. It takes about a tank full before you star to notice anything (before the olf fuel gets flushed out)
Mig