so i have an '04 GTP. Only Modifications I've done are a k&n Air Filter and my brother put in a Vortex semi circle spiky contraption (sorry i dont know what its called anymore it was 5 years ago) in the air tube that feeds the engine. As far as gas mileage goes my car does amazing on highways i can drive from Miami to Orlando in about 3/4 of a tank. If i remember the last time i ran a trip meter on the DIC it was about 300. However in this godforsaken city im getting about 13 - 14 MPG with a light foot. Sometimes less if i drive a bit harder. Is there anything i can do to improve that?
