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Along with the above make the mechanical baseline as good as possible. No steering slop, perfect alignment, etc. All book maintenance to date/miles. TAKE NOTHING FOR GRANTED! Take your time on tire choices, it's a big deal on a truck.
Aero and gearing are about it for vehicle spec. Plenty to read about around here in re the former (aerolid); I'd start with a half-tonneau cover ((where pressures are equal on both sides of tailgate).
Smart Use would be planning trips of all types. Combined errands, best routing (loop), etc.
A baseline mpg is needed. Improvements are the percentage decrease in fuel burn to that baseline (highs or lows per tank are meaningless, ONLY the average mpg counts).
Good luck.
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