I bought a 2012 sierra gmc from the GMC dealer already with a 4" lift, of road tires & XD custom rims. The truck was averaging about 330 miles per tank. Four months later I instald a airaid intake filter, magna flow dual exhaust and a under cover for the bed hoping that it would increase the gas mileage but it has not increased it at all. I had a chevy pryor and did the same and you noticed a big differnce. Any suggestions as to why ther is no gas savings?
Saturday, November 24th, 2012 AT 4:19 PM