Its not the altitude but the changes in altitude that is killing your MPG.
In terrain that rugged, you should be ruthless about weight reduction. Not just junk inthe trunk but actual parts you don't use. A good candidate might be your rear seats.
If you have money for a mod, get the lightest wheels that will fit.
All avoidupois you don't have to drag up the mountain.
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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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