Fuel mileage

This is a TJ forum buddy.

But depending on tire size. Regearing is a good guess.
 
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So a 33. I’m not sure what would be good with a JK. You would be better off asking on a JK page.
 
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You do have some options with a JK as far as tuners to help the 3.8L. Not sure how dramatic of an increase you might see, but jkowners forum would be a good place to get some advice. They will be much more up on mods to help you out. We TJ folk are all focused on our tractor engines.