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Over-drive. or change the rear end ratio.
Tune. Econo cam.
Narrower, taller, over-inflated tires and/or LRR tires. Lighter wheels.
Aero mods. Boat tail, under-tray.
Weight reduction. (not going to have that much impact)
Alternator/accessory delete, under-drive, whatever.
Block heater, grill block, warm air intake.
Plug-in hybridize it?
More importantly...will you be camperizing it? daily driver? work vehicle? Off-road beast?
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