On any of the Forums I vist the topic of Programmers and Chips come up all the time. Most agree you can get more pull power, but they all pretty much agree that Fuel mileage doesn't change or if they claim it does, it's only 1/2 to maybe 1 MPG. My GM has plenty of power so I'm not about to upset the apple cart.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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