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gears will improve your MPG ( if it puts your normal cruise speed back into the powerband RPM range), but I doubt get it back where it was before the tires, since the new tires are heavier, and have more rolling resistance blah blah..

Ive heard GREAT things about the HEI swap..



ozarkjeep
1977 CJ5 looking for a Hard top near NW Arkansas!
 
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