3 mistakes on my part... 2.4L Ecotec (upped from Cobalt 2.2 platform); forgot the truck was a Diesel, and here's the
link to the Bed Cover. I think Dave has something similar.
It's a Ford F-350 7.3L Manual, but check out
Big Dave's garage entry for lowering and aero mods. He's getting 24-25 mpg.
I've heard that chipping for economy is popular too (with or without injection)...
RH77