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No fuel mileage

1K views 2 replies 2 participants last post by  97cummins 
#1 ·
My father in law has a 2004 3500 4x4 and auto trans and has an afe cold air intake on it, its chipped and an afe blade runner is also on it. But his mileage has done nothing. He doesnt constantly have his foot in it. So what could be the problem? any help would be greatly appreciated.
 
#2 ·
Only way I have found to increase milage in these things is towing with them brakes them in better. I constantly see thoses that get the best miliage tow a good bit with their trucks, now I'm sure someone might chime in and say I've never towed and I get 23MPG Hwy, Just my 2/10 of a dime.

What programmer/box is your FIL running??
 
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