Powered By Ford
Join Date: Jan 2007
Location: Boonville, NY (upstate)
Thanked 56 Times in 47 Posts
I think curtis (before he broke his truck) said he got 21 or 22mpg with an economy tune and 305s, but yeah a programmer is your best bet, keep your tires at 55psi also. I've heard with the PSD's (not sure about the DMax) that the exetreme race tunes get the best mileage....Its definitly worth a shot..
04 Silverado 2500HD LB7/Allison, EFI live by duramaxtuner.com with DSP5, 4" MBRP turbo back straight pipe, polished 5" tip, 5% tint, riding on 285 fierce attitudes, many more mods....