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 · Diesel |
| Combined MPG | 16 | 24 |
| City / highway MPG | 14 / 20 | 22 / 26 |
| Fuel a year | $4,200 | $4,000 |
| Tailpipe CO₂ (g/mi) | 561 | 430 |
| Engine | 5.3 L 8-cyl | 3.0 L 6-cyl turbo |
| Transmission | Automatic 8-spd | Automatic 10-spd |
▲ marks the better official figure on that line: more range, MPG or MPGe; less fuel cost or CO₂. From fueleconomy.gov.