Photo: GMC Sierra by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons. It shows the model, not always this exact version.
GMC · model year 2021
2021 GMC Sierra 4WD AT4
Pickup · 4-Wheel Drive · Gas · EPA class: Standard Pickup Trucks 4WD
EPA figures · 2021fueleconomy.gov
16MPG combined
14/19MPG city / highway
$5,150fuel a year
555 g CO₂ per mile 6.2 L 8-cyl Automatic 10-spd
This car on fueleconomy.gov, read 2 October 2026. Your own figures depend on how and where you drive.
Where it places
Every figure on record
- Combined MPG
- 16 MPG
- City MPG
- 14 MPG
- Highway MPG
- 19 MPG
- Annual fuel cost
- $5,150
- Tailpipe CO₂
- 555 g per mile
- Model year
- 2021
- Body
- Pickup
- EPA size class
- Standard Pickup Trucks 4WD
- Drive
- 4-Wheel Drive
- Engine
- 6.2 L 8-cyl
- Transmission
- Automatic 10-spd
- Fuel
- Gasoline
Efficiency
Running cost
The car
Powertrain
More GMC model years
2021 GMC Sierra 4WD AT4
17 MPG · $4,850 fuel a year 2021 GMC Sierra 4WD AT4
24 MPG · $4,000 fuel a year 2021 GMC Sierra 4WD AT4
18 MPG · $3,700 fuel a year 2021 GMC Sierra 4WD AT4
18 MPG · $3,700 fuel a year 2021 GMC Sierra 4WD AT4
16 MPG · $4,200 fuel a year 2021 GMC Sierra 4WD AT4
16 MPG · $4,200 fuel a year 2021 GMC Sierra 4WD AT4
17 MPG · $3,950 fuel a year