GMC Sierra 4WD AT4X: MPG and fuel economy by year
The EPA has rated the GMC Sierra 4WD AT4X across 4 model years, from the 2023 GMC Sierra 4WD AT4X through the 2026 GMC Sierra 4WD AT4X. The most recent 2026 GMC Sierra 4WD AT4X returns 19 combined MPG.
Pick a year below to open the full GMC Sierra 4WD AT4X page for that model year. Each year page covers combined, city, and highway MPG, the trim variants the EPA rates separately, the annual fuel cost across three driving patterns, and a year-over-year comparison so you can see whether the car has improved.
Fuel economy by model year
Combined MPG, city MPG, highway MPG, and the EPA's estimated annual fuel cost for every model year of the GMC Sierra 4WD AT4X. Click any year to see the full breakdown for that model year, including trim variants, the drivetrain, and a comparison against other vehicles in its segment.
| Year | Model | Combined MPG | City | Highway | Annual fuel cost |
|---|---|---|---|---|---|
| 2026 | 2026 GMC Sierra 4WD AT4X | 19 MPG | 19 MPG | 20 MPG | $4,250 |
| 2025 | 2025 GMC Sierra 4WD AT4X | 19 MPG | 19 MPG | 20 MPG | $4,250 |
| 2024 | 2024 GMC Sierra 4WD AT4X | 19 MPG | 19 MPG | 20 MPG | $4,250 |
| 2023 | 2023 GMC Sierra 4WD AT4X | 15 MPG | 14 MPG | 17 MPG | $4,600 |
How the GMC Sierra 4WD AT4X compares against the Standard Pickup Trucks 4WD class
Buyers usually compare the GMC Sierra 4WD AT4X against other cars in the same EPA class. The list below shows the most efficient cars in the Standard Pickup Trucks 4WD class for the 2026 model year, the latest year on this page. Each link opens the full page for that car.
Source: U.S. EPA fuel economy dataset. Annual fuel cost assumes 15,000 miles of driving per year and a 55% city, 45% highway split.