I saw zero gain after deletes. I'd guess I got 1-2mpg maybe. I'm running no power, and I wanna hear the old girl purr. So ya, I gained nada.
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2012 Chevy 3500HD LTZ, Crew Long, Z71, EFI Live by No Limit Automotive and Performance, WCF 475 Over Stock, 5" Flo~Pro Turn Down Exhaust, Fass 150, WCF CP4 Delete, Sportsman CP3, Torque Converter, 275/70/18 M55 on Fuel Mavericks, White Line-x rocker panels, White line-x Bushwacker pocket flares, DDM Tuning HIDs 4300k, Hi/Lo Beams, Custom JetCraft sled deck, Nathan K3LA, Onboard Air Via Viair 400c/444c Compressors, Autometer Pillar, with Cobalt Boost, Pyro, Rail Pressure Gauges.