Does it doing only with the car moving, or also when it's sitting still?
Oh, and your gas gauge is working fine, these things really do get that kind of mileage...
Texas Full Size Jeep Association
1987 Grand Wagoneer
1999 Wrangler Sport
Formerly of DFW/Gun Barrel City, TX - eventually to return...
“Freedom is never more than one generation away from extinction” by Ronald Reagan.