07 Yukon XL Denali with the 6.2 and a Black Bear Performance 93 octane performance tune. 10-12 in the city; 13-15 on the highway; 16-18 on the highway with the wife in the truck with me.
10-12 city is about what I am seeing, I guess that's just what the 6.2 gets when DOD is off if it's doing that on your almost stock ride. About 2 under my 5.3 then.
Oh well guess gotta live with it lol.