My vehicross has a pretty much stock exhaust and engine with a powergem intake(just a step up from stock nothing major yet) i only get about 225 mileage on a whole tank of gas. basically 10 miles to the gal. Its killing me. anyone have any tips on how to get this up so i get more mpg i see other vx owners getting 300 up to 450 how the heck is that possible any and all help much appreciated or it might go up for sale. Thanks