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Good luck getting answers, thats my thread below the one you started and its a month old with one reply. I have installed a K&N filter and went from 13.2 to 14 mpg. I have only 7700 miles so engine breakin could be causing the increase. My Flowmaster exhaust should be in this week so I will post after install. I am leary of the programmers, $400 and no garantee of mpg increase. I have an auto with 3.73 gears and factory 20" wheels. The tires are the same height as the 35" I have on my other 4X4 so when these wear out maybe some larger ones. Only regret was not getting 4.10 rearend. I have friends with diesels not getting the mgp I am, but they can pull a hell of a lot more. I pull maybe once a month so gas works for me.
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