Man since my install on the CAI from AEM my gas has been poor could the result of better air going into the engine give it poor gas mileage? I mean more air=more combustion correct? I'm getting like a stinking 18-20miles/gallone in the city driving. When I press on the gas hard for a full tank every so often then my mileage drops even more like 14mile/gallon. It really stinks! I put in premium one time and calculated it for some damn reason I got back up to 25mph/gallon in casual city driving and hard driving here and there. Does anyone know the answer to this?