← all 2021 GMC Sierra Cab Chassis 2WD trims
2021 GMC Sierra Cab Chassis 2WD — 5.3L 8-cyl, Automatic 6-spd, RWD
This 2021 GMC Sierra Cab Chassis 2WD (5.3L 8-cyl, Automatic 6-spd, RWD) takes regular (87-octane) gasoline. REGULAR
15
MPG combined (14 city / 18 hwy)
$4,150
est. fuel cost / year (EPA, 15k mi)
590 g/mi
tailpipe CO₂
Other 2021 GMC Sierra Cab Chassis 2WD trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 4.3L 6-cyl, Automatic 6-spd, RWD | REGULAR | 17 | $3,650 |
| 5.3L 8-cyl, Automatic 6-spd, RWD | REGULAR | 14 | $4,450 |
EPA fuel type: Regular · class: Special Purpose Vehicle 2WD · retrieved 2026-06-14.