For your information guys, if you put high octane fuel in an engine that runs on regular 87, your emissions will go up, your car might run like crap, and it is a waste of money. High octane fuel is for high compression engines. You probably are saying "Well, the turbo models compression ratio is way lower, why are you guys using it." My answer to that, how static compression ratio will be the same 7:8:1 or 8:5:1, however, when boost kicks in, the boost compression ratio will go higher than 12 or 13:1. At those compression ratios (None static), you need higher octane fuel to resist detonation, pinging and knock.