I love this vehicle .I got 13 city mpg in my previous all wheel drive 2005 denali and consistently get 19 city mpg in my Denali hybrid 4 wheel drive. I get about 20 mpg highway now vs 17 mpg in previous non hybrid Denali .
I frequently go off road and had my doubts about the 22" wheels but hasn't presented a problem, although I'm not pushing it off road.
I do frequently ford a wide river … that I need to cross to
Get to my cabin up to about 18" water depth in 4 wheel drive, but won't attempt it at higher water depths. I usually ford about a foot of water with absolutely no problems. I have 22,000 miles with no problems except having heated seat replaced under warranty.