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It won't help MPG in any measurable way, but might slightly improve acceleration if you get a lightweight pulley set and underdrive the accessories.
I probably wouldn't do it again given the option to save the money and effort. The manufacturers would be using them if it made economic sense, or even boosted 0-60 performance in a meaningful way.
If you do a lot of commuting miles, it's probably cheaper to let the Jeep sit most of the time and buy a very cheap/efficient commuter vehicle.
I sold my Jeep because the MPG was terrible along with reliability, and I rarely need the clearance.
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