My brother has a 02 7.3 and used to have Hypertech, He was getting 22mpg with that, but he bought another truck (same thing with less miles) it had a Programmed Computer with 6 position switch. I think he said T&S Performance??? Anyway... He doesn't see that milage anymore. He says the Hypertech was the way to go for milage.
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2001 GMC Sierra 2500HD CCSB 4x4 Duramax/Allison
EFI Live/ DSP5 "MAX EFFORT" thanks to Rob Coddens
Built Trans, Bank's Ram Air Intake, Big Head Wastegate, Banks Intercooler, PPE Boost Valve, Ported Intake Horn, Shimmed FPRV, FASS 150 Lift Pump, 40 overs, Optima RedTops,
20" Forged Alluminum WELD's 33's Nitto Trail Grapplers
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