2010 denali
I am very light...the trick with this vehicle is slow starts, cruise at steady speed and coast to stops, if u do that and keep ur tires correctly pressured, ur numbers should mirrow mine.
I get 15/16 city and 20/21 hwy at 60, 19/20 at 65, 18/19 at 70, 17/18 at 75
I just did two 1000...