WoW! For a 6 that does suck!!! Especially with the way gas prices are going these days. If I got that milage with my new 5L I'd be *issed too. Like others have advised: Injectors, and gears would be the first things I would check. Driving habits next! Good Luck
Magna 2300 TVS Supercharger,500+RWH,355 Gears, 3" Pypes OffRoad X Pipe,3" GT500 Exhaust w/High Flo Cats, w/GT500 Axel Backs,18"X10" NZO Halo II's w/ Michlin Pilots.