I agree that the 4X2 and 4X4 are little different but here is what I have found. While driving to Seattle last weekend I found that above 65mph (70-75)my gas mileage was around 17-19 mpg but if I kept my speed around 55-60mph I tended to average 21-23 mpg. On a separate topic I was surprised at how nice the X tracked on the freeway at higher speeds--felt very well planted. It also has a lot of torque no matter what speed you are going!