There were a whole lot of talented engineers that squeezed every bit of MPG out of this Jeep that was feasible to be had. There are more mods you could do, but most likely, you'll never recoup the cost of doing them. Like the previous poster said, drive like grandpa.
Once you lift and get bigger tires, a gear change will optimize mileage and performance. No matter what kind of sticker you put on it, it's still a two ton aerodynamic brick.
08 4 Door Rubicon
Member of Two Trackers 4wd Club
Great Lakes Four Wheel Drive Association
United Four Wheel Drive Associations