Not too much you can do. Lower restriction air filter and Corsa type exhaust helps sound and performance a little but any fuel mileage increase is marginal. I have seen a little over a 1 mpg increase with air, exhaust, and Mobil one synthetic. If you are serious about gas mileage, the best increase comes from keeping highway speed at or below 60. The big tires, higher ground clearance and box shape kill mileage over 65 and into headwinds.
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