2021 GMC Sierra 4WD vs 2021 GMC Sierra 4WD AT4
| EPA figure | 2021 GMC Sierra 4WD | 2021 GMC Sierra 4WD AT4 |
|---|---|---|
| Model year | 2021 | 2021 |
| Body · drive | Pickup · 4-Wheel Drive · Gas | Pickup · 4-Wheel Drive · Gas |
| Combined MPG | 16 | 16 |
| City / highway MPG | 15 / 20 | 14 / 18 |
| Fuel a year | $5,150 | $4,200 |
| Tailpipe CO₂ (g/mi) | 539 | 543 |
| Engine | 6.2 L 8-cyl | 5.3 L 8-cyl |
| Transmission | Automatic 10-spd | Automatic 6-spd |
▲ marks the better official figure on that line: more range, MPG or MPGe; less fuel cost or CO₂. From fueleconomy.gov.