I have been averaging between 18 to 20 MPG since I bought my 2014 JKU WIllys WHeeler with 32" mud tires, all the skid shields from Rubicon, Ace side steps/rock slider that fit over Rubicon rock sliders, and 3.73 gears. If I keep it below 65 MPH. It seems to get the best MPG arund 45-50MPG when it is early in 6th.