Im not sure if you will get another 3-4 mpg, that is quite an increase. It should get you a little, so will a cat-back exhaust system. Do you have car or truck tires on it? Ie; P245 is a pass car and a LT245 is a truck, the difference being the truck tires usually have higher air pressure ratings and will roll with less resistance
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Tuesday, February 17th, 2009 AT 7:48 AM