@11.4 MPG on the onboard computer. Adjusted appx 10% for 35'' tires, that's appx. 12.5 actual MPG ..... I went 62 CPU miles ( appx 67/68 actual) past "zero" and had a 24.9 gallon fill up. I was sweating it big time! That being said, those last 50 miles I really slowed down to 65/68 MPH from my usual road trip 82-85 MPH. This was on my mammoth Road trip and I just had to make it to that usual fill up spot! If I fill up right when the computer hits zero I only fit about 19.2 gallons or so. I'm on stock gears and don't feel the need for 4:88's yet. But I think natural progression will eventually lead me to 37's and 4:88's down the road.