Here in Mexico u can get only premium that is 92 oct, i cant get race fuel over here thats why but i think i wll be ok whit that coz i have the web 4 it has alot of lobe and duratio, John told me i will be ok at 0 elevation at 92 oct and i trust his word, the reason i ask is coz i think whit the add of comp will create more heat at spark plug.