Most of the full-size Broncos from '80 to '96 that I've seen were fitted with the 300cu.in. inline-6 and a manual transmission, and most likely to be assembled in Venezuela. Without extensive mods to enhance its off-road capabilities and driven conservatively, 20MPG wouldn't seem unachievable.
Anyway, do you know the differential ratio currently fitted to your ride? And would you eventually be comfortable to try a higher ratio even if that could lead to a compromise of its towing capability?
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