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I cannot complain about my 09 Denali. We drove it from Utah to NJ and back and averaged around 18mpg cruising around 5 above the limit. With its 31 gallon tank I still had a 500+ range.
AWD is nice, wife was always confused before what to use with our Envoy Denali. 2WD/A4WD/4WD. She also has Raynard's Syndrome to go with her Lupus so the heated steering wheel is fantastic. 13-14 in the city isn't that bad also.
AJ you must have 'feather foot' ... I'm lucky if I squeak by at 12mpg in the city.
That's why
5.3 SLT with Denali mods > 6.2 Denali
The listed mpg for the denalis is 13, and mpg ratings are always a conservative estimate for most cars/trucks to help carmakers sell more vehicles. 12mpg in city driving is the norm for these trucks ... to get 16.5 it must be a city made of 50% highways.