Two things I've found to be effective (beyond the no-brainer stuff like maintenance and driving habits) are aerodynamics and gearing.
You have a good start going on the aero, but the most effective aero mod for pickups is an aero shell over the bed. Your biz constrains your choice of a bed shell. Cleaning up those cavernous Dodge wheel wells couldn't hurt.
What's your gear ratio?
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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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