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What engine does it have 4.6 or 5.4? I'm assuming these are just about the same as a f150 if so 20 mpgs should be easily attainable with a few mods. My 99 f150 gained about 2 mpgs from switching to an electric fan so that's a good start. I also recommend a lawn edging air damn extension, synthetic fluids in diffs and transfercase, upper grill block and 12 hole injectors
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