if you're willing to dish out the money and like investing in you jeep Cold Air Intake, Muffler/Exhaust, and throttle body spacer will all help you gas mileage. Rough investment cost of 4-600$ depending on what you get, V8's will be more expensive. Have fun with it!
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07 3.7L. 12000K HID, 3000K HID spotlights, K&N 63-1545 Intake, Airaid TBS, NGK Iridiums, Flowmaster 50 series muffler, Stage 2 Jetchip, Daystar 2.5" liftkit, Spidertrax 1.5" spacer, Toyo Muds 265/70/17