I drove my moms 2000ish grand caravan with 3.3L and 44 lbs in tires and got
31.1MPG average over about 180 miles with city driving, hills, stops, and back roads. NO MODS!! I am going to mod it soon though, maybe hit that 40 mark.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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