Mileage is definately improving after you put some miles on them. Been averaging 13-14 until lately; now seeing 16 + 70/30. Amsoil 5w30, and AFE filter Somewhat loaded with tools and supplies, and no ugly ladder rack. 60-65 lbs psi in all the tires. 2012 2500 HD, SV, 5.6L, LO roof Also noticed that if you also reset the time, mph, and mpg on the display at fillup; it is more accurate at the next fillup. Any one else seeing improved MPG?