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I have 2.8's in my diesel suburban but thats an 8 banger, not a ranger.
Generally speaking higher gears give higher FE, but only if you keep your foot out of it ESPECIALLY in 5th, you need to downshift to conserve FE if you actually end up overgeared but a ginger driver can take advantage of gears higher than the vehicle can realistically tolerate by not overloading the motor at low RPMs.
Good Luck
Ryan
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