Is your truck a 4x4 or 4x2?
If its 4x2 you have some extra options.
Slam the truck with drop I-beams & shackles. That got me an extra 1.0 MPG.
Swapping in a T56 from a Mustang would be a bunch cheaper than a Gear Vendor and would get you the bebefits of a manual (efficincy + easy hypermiling).
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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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