Trade it ! The normal things like tire pressure, alignment, filters and driving habit of course help and you could try a good fuel injector cleaner and premium fuel to see if you get an increase in MPG worth the expense of high test, some times it is. But those Jeeps are notorious for poor fuel economy, as most 6 Cly. 4x4s are. I seen reports of them getting only 12 or 14 MPG in normal every day driving and the V8's only getting 7 or 8 in town.