I have the 22E on the Chevy Chassis 6.0l Vortec. Mine is 10 months old and I just passed the 14000 mile mark and I have kept track of every gal of gas that went in to it. I am getting an avg of 10.9 mpg. 2500 miles through New England, 8000 miles across the US around the west and back to WV, 2700 miles down the east coast to Key west and meandering home. And a little over 1000 miles wandering the WV mountains. The worst mileage I got was going across SD with a 30 mph cross wind and back across KS with the same 30 mph cross wind avg 9.2. The best was going across PA and OH turnpike avg 12.4
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