← all 2021 GMC Sierra 2WD trims
2021 GMC Sierra 2WD — 5.3L 8-cyl, Automatic 6-spd, RWD
This 2021 GMC Sierra 2WD (5.3L 8-cyl, Automatic 6-spd, RWD) takes regular (87-octane) gasoline. REGULAR
17
MPG combined (15 city / 21 hwy)
$3,650
est. fuel cost / year (EPA, 15k mi)
523 g/mi
tailpipe CO₂
Other 2021 GMC Sierra 2WD trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 2.7L 4-cyl, Automatic 8-spd, RWD | REGULAR | 21 | $2,950 |
| 2.7L 4-cyl, Automatic 8-spd, RWD | REGULAR | 21 | $2,950 |
| 5.3L 8-cyl, Automatic 8-spd, RWD | REGULAR | 19 | $3,300 |
| 4.3L 6-cyl, Automatic 6-spd, RWD | REGULAR | 17 | $3,650 |
| 5.3L 8-cyl, Automatic 8-spd, RWD | REGULAR | 17 | $3,650 |
| 5.3L 8-cyl, Automatic 6-spd, RWD | REGULAR | 16 | $3,900 |
| 3.0L 6-cyl, Automatic 10-spd, RWD | DIESEL | 26 | $3,000 |
| 5.3L 8-cyl, Automatic 6-spd, RWD | FLEX-FUEL | 16 | $3,900 |
EPA fuel type: Regular · class: Standard Pickup Trucks 2WD · retrieved 2026-06-14.