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Lynnmsp · 10-05-2014, 05:14 PM

What program are you or Ed using? I have 03 8.1 with Allison trans and getting 10-11 and 12-13 highway.Thats if I drive 55-60 mph.My tires are one size larger than stock.Its a crew cab single rear wheel 2500HD with 4:10 gear.

10-05-2014, 05:14 PM	#20
Lynnmsp Junior Member Join Date: Feb 2005 Location: USA Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: Gm 6.0 litre v v t v8 tow vehicle engine What program are you or Ed using? I have 03 8.1 with Allison trans and getting 10-11 and 12-13 highway.Thats if I drive 55-60 mph.My tires are one size larger than stock.Its a crew cab single rear wheel 2500HD with 4:10 gear.