By feeling, I agree Optimax gives more power, but it feel like my car is addicted to it, just like taking drugs, I couldn't use other kind of fuel now, I used to be using BP Ultimate before but right now my car will be hard to start up and stall if i use fuel other than Optimax, so i don't know, i don't like it this way

Anyway, heard that every petrol company put different formulas in the fuel on summer and winter, so would anyone explain about it?

PS: Never tried BP vs Shell on dyno, i just used Shell to run the dyno and i got the "so-call" 100kw on wheel and that is quite fake to me