In my '03/'04/'07s, on pump gas in the sand, mpg was roughly 13 mpg's. In the rocks (lower revs, gear tall for traction), I've squeaked out around 23mpg. Now on straight 110 leaded race juice and the lean jetting that goes with it, my mileage is awesome! In the sand its almost 20mpg and the rocks/dual-sport events I've squeaked out 34mpg!!! (Riding on the pilot, low rpm and carrying speed to maximize mpg since the only extra 110 leaded there was I had in a canteen). Terrain, riding style, fuel & jetting to accommodate that fuel dictate what mpg's you'll get.