2026 GMC Sierra 4WD AT4X
Vehicle specifications and fuel economy data from EPA/DOE
Combined MPG
19
City MPG
19
Highway MPG
20
Fuel Type
Diesel
Annual Fuel Cost
$2,950
CO2 (g/mi)
524
Vehicle Details
- Year
- 2026
- Make
- GMC
- Model
- Sierra 4WD AT4X
- Vehicle Class
- Standard Pickup Trucks 4WD
- Engine
- 6 cylinders, 3.0L
- Transmission
- Automatic 10-spd
- Drive
- 4-Wheel Drive
- Fuel Type
- Diesel
All Trims
| Trim | City | Highway | Combined | Fuel | Engine | Transmission |
|---|---|---|---|---|---|---|
| Auto 10-spd, 6 cyl, 3.0 L, Diesel, Turbo | 19 | 20 | 19 | Diesel | 6 cyl 3.0L | Automatic 10-spd |
| Auto 10-spd, 8 cyl, 6.2 L | 14 | 16 | 15 | Premium | 8 cyl 6.2L | Automatic 10-spd |
Other Years
About This Data
Fuel economy data from the U.S. Department of Energy and EPA fueleconomy.gov. MPG estimates are based on standardized EPA test procedures. Actual mileage may vary based on driving conditions, habits, and vehicle maintenance. Annual fuel cost estimates are based on 15,000 miles driven per year at current fuel prices.
What is combined MPG?
Combined MPG is a weighted average of city (55%) and highway (45%) fuel economy. It represents typical mixed driving conditions.
What is MPGe?
MPGe (miles per gallon equivalent) is used for electric and plug-in hybrid vehicles. It represents the distance a vehicle can travel on the same amount of energy as one gallon of gasoline (33.7 kWh).