with the low compressoin ratio on the f22 engine you don't need higher octane fuel the higher octane the fuel the higher the flash temperature. which means that the fuel can take more compression before it detonates. with the low compression of the f22 you don't need high octane fuel. the engine was designed for economy, not performance. there are things you can do to make 92 octane fuel the optimal fuel for your engine like adjusting your timing and whatnot, but if you are just putting high octane fuel in your car just because "it's more expensive so it must be better for it" you'll actually see worse gas mileage and your performance may suffer in the long run. there's no need for octane booster in the the f22. your owners manual actually says to use 87 octane fuel. the only fuel additives i'd suggest are like elite said, fuel injector cleaners and stuff like that. most brand name gasoline has additives already in it to keep your fuel system running optimum performance.