98 XJ 4.0 A/T it came with a Jet chip, K&N filter, T/B spacer, and exaust. It's my first auto, and I'm still having trouble staying off the stupid peddle, and I only check my milage on the weeks I don't go wheeling. I'm averaging 15.8mpg just going back and forth to work, just over 200mi to the tank. Oh, if I get below 1/8 tank it starves for fuel on left hand turns.