2021 GMC Sierra 4WD AT4 vs 2021 GMC Sierra Cab Chassis 2WD
| EPA figure | 2021 GMC Sierra 4WD AT4 | 2021 GMC Sierra Cab Chassis 2WD |
|---|---|---|
| Model year | 2021 | 2021 |
| Body · drive | Pickup · 4-Wheel Drive · Gas | Special purpose · Rear-Wheel Drive · Gas |
| Combined MPG | 18 | 15 |
| City / highway MPG | 16 / 21 | 14 / 18 |
| Fuel a year | $3,700 | $4,450 |
| Tailpipe CO₂ (g/mi) | 494 | 590 |
| Engine | 5.3 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.