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What I've found:
If you can live with a tonneau, get one. I had a flat tonneau and it was worth 1.5 MPG. Better yet, a fastback bed cover.
To help change the nut behind the wheel, install a pyrometer and a digital tach. For Ford (I-H) 7.3s the magic numbers are 2000 RPM and 600 degrees F EGT. The numbers should be similar on a 12V Cummins.
Since you are 4x2 maybe you can economically regear. I dropped from 3.73s to 3.08 gears. That gained me 3 MPG. But you have an auto and those gears may wreck your auto. I get away with it because I have a hand-shaker. Don't sweat the towing/hauling with 3.08s. My 7.3 tows Bobcats, macinery, and five tons of building materials just fine. No self-respecting Cummins jockey will admit the school bus motor is better than a 12V Cummins at low RPM.
A 4x2 can also be practically slammed, resulting in a 4 or 5 percent reduction in frontal area.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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