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We have a 02 Cab and Chassis 4x4 flatbed witht the h.o. engine and a 6sp. manual transmission and 3:55 gears. Uncle is complaining that he is only getting 15 mpg out of it even on extended trips on the highway. It is 100% stock.

What can we do to improve mpg? We have a new air filter. We also have a superchips programmer on the way. Should we open up the exhaust or any other ideas?
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