Since I've got mine chipped and stopped driving like a knob all the time, I get an average of 30 - 32 Mpg from my 2.8Q...
That does mean driving along the bypass at 55 mph though... but, if you line up and plan your round a bouts, you can take them at 40mph, leave everyone behind who practically stop and save on fuel as you don't have to get from 5mph up to 40mph again.