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fuel mileage
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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    I have a 2010 LMM crewcab with all of the deletes, lift pump, etc and EFILive from Idaho Rob at ATPTrucks. Truck is lifted 7" on 355/40/22 trail grapplers and has 92k miles on it. I have 5 tunes with the DSP5 switch. I typically leave it on my #3 tune which is my fuel economy tune and I do not...
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