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 2020
2020 GMC Sierra 4WD AT4
Pickup · 4-Wheel Drive · Diesel · EPA class: Standard Pickup Trucks 4WD
EPA figures · 2020fueleconomy.gov
24MPG combined
22/26MPG city / highway
$4,000fuel a year
427 g CO₂ per mile 3.0 L 6-cyl turbo 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
- 24 MPG
- City MPG
- 22 MPG
- Highway MPG
- 26 MPG
- Annual fuel cost
- $4,000
- Tailpipe CO₂
- 427 g per mile
- Model year
- 2020
- Body
- Pickup
- EPA size class
- Standard Pickup Trucks 4WD
- Drive
- 4-Wheel Drive
- Engine
- 3.0 L 6-cyl turbo
- Transmission
- Automatic 10-spd
- Fuel
- Diesel
Efficiency
Running cost
The car
Powertrain
More GMC model years
2020 GMC Sierra 4WD
17 MPG · $3,950 fuel a year 2020 GMC Sierra 4WD
16 MPG · $4,200 fuel a year 2020 GMC Sierra 4WD AT4
18 MPG · $3,700 fuel a year 2020 GMC Sierra 4WD AT4
18 MPG · $3,700 fuel a year 2020 GMC Sierra 4WD AT4
17 MPG · $4,850 fuel a year 2020 GMC Sierra 4WD AT4
16 MPG · $4,200 fuel a year 2020 GMC Sierra Cab Chassis 2WD
17 MPG · $3,950 fuel a year