2021 GMC Sierra Cab Chassis Specs
EPA fuel economy, engine specs, and towing capacity
At a Glance
17
MPG Combined
15 city / 0 hwy
15 city / 0 hwy
4.3L V6
Engine
RWD
Drivetrain
$3,088
Est. annual fuel
15k mi @ $3.50/gal
15k mi @ $3.50/gal
All Trim Levels — Fuel Economy
| Trim / Transmission | Fuel Type | Engine | Drive | City | Hwy | Combined | CO₂ (g/mi) |
|---|---|---|---|---|---|---|---|
| Automatic 6-spd | Regular | 5.3L V8 | RWD | 14 | 0 | 15 | 590 |
| Automatic 6-spd | Regular | 4.3L V6 | RWD | 15 | 0 | 17 | 523 |
| Automatic 6-spd | Regular | 5.3L V8 | RWD | 13 | 0 | 14 | 634 |
| Automatic 6-spd | Regular | 5.3L V8 | 4WD | 14 | 0 | 15 | 593 |
| Automatic 6-spd | Regular | 4.3L V6 | 4WD | 14 | 0 | 15 | 592 |
| Automatic 6-spd | Regular | 5.3L V8 | 4WD | 13 | 0 | 14 | 635 |
Source: EPA FuelEconomy.gov. MPG figures are for reference; actual mileage varies.