I checked mine with a GPS, with my 31s when my speedo reads 50 I am doing 58.9 MPH. When I calulate my MPGs I get about 19 MPGs, my speedo is about 18% off so when I add the miles I'm getting about 23 MPGs. When my Kia was stock I got about 24 to 25 MPGs and my wife got about 27 MPG. I don't think thats to bad of a drop for adding bigger tires, a lift, a heavy winch and a heavy rear bumper.

Dennis

95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.