Thanks petrified.rabbit for your quick response. although i was already familiar with some of those concepts i did learn a little. You see i am wondering if there is a product formula such as, (aftermarket air filter + high performance spark plugs + lowered suspension = more MPG's) and i dont know why, but my car does not have a 5th gear... I know that would help me out big time.. I think it is so stupid and antiquated that it does not, i mean come on its a 2004 not an 87'!!