Hi guys i have a 2002 s10 quad cab. It gets about 17 MPG. On the high way it does about 2300 rpm around 70 mph. I want to help the mpg. Would switching from I believe 3:42 and or 3:73 to a lower ratio like 2:50 or 2:73 put a big dent in MPG or will I only see like a 2 MPG change. I would imagine on the high way the rpms would drop to around the 1500/1800 rpm range.