Honestly none of the chips or tuners out there will add any efficiency to a jeep engine. Some will cause issues.
First realize you driving a brick with poor aerodynamics.
The best solution for better gas mileage is light on the gas, tire pressure,size,weight and tread. Keep it under 65 on the highway.
A good tune up, plugs ( champion 7034), new air filter, clean the TB and IAC.