There are a range of diff options for them. I run the 4.11 diffs on 33" tyres on my few, all manual, non-turbo, tweaked injector pump. I could happily go to the 4.6 or 4.8 diffs.
They're not fast or pretty or too comfortable, but as said above "stump pulling torque" they'll tow about anything else on the road backwards, up hill and down dale.
Fuel usage? I couldn't tell you. I just fill em when they're looking to get to about half.
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