← all 2021 GMC Sierra Cab Chassis 4WD trims
2021 GMC Sierra Cab Chassis 4WD — 5.3L 8-cyl, Automatic 6-spd, 4WD
This 2021 GMC Sierra Cab Chassis 4WD (5.3L 8-cyl, Automatic 6-spd, 4WD) takes regular (87-octane) gasoline. REGULAR
15
MPG combined (14 city / 17 hwy)
$4,150
est. fuel cost / year (EPA, 15k mi)
593 g/mi
tailpipe CO₂
Other 2021 GMC Sierra Cab Chassis 4WD trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 4.3L 6-cyl, Automatic 6-spd, 4WD | REGULAR | 15 | $4,150 |
| 5.3L 8-cyl, Automatic 6-spd, 4WD | REGULAR | 14 | $4,450 |
EPA fuel type: Regular · class: Special Purpose Vehicle 4WD · retrieved 2026-06-14.