After much thought and many dollars for gas I need to do something. I don't want to sell the XJ but I need to improve the mileage. I've got a 4.0, AW4, 4.11 gears, 32x11.50 BFG AT's and 5" of lift. I started lifting from day one, 2000, and do not know what my mileage should be. I do know...