There are many variables that affect mileage such as: tire inflation, the type of fuel, weather, elevation, the speed at which you drive, the gear in which you drive, the area is which you drive (city, f-way, rural etc) the speed with which you accelerate, engine maintenance, excessive idling, cruise control, the grade of motor oil you use, and of course, etc. In short, mileage is complicated.
That said I get 300-350 using AUTO 4WD most all the tine this winter. In summer just over 500 miles on a tank.
2021 Sierra Denali Ultimate 6.2L CC 4WD 14,000 miles mostly 2-land rural blacktop with occasional stop lights.
