← all 2021 GMC Sierra 4WD trims
2021 GMC Sierra 4WD — 5.3L 8-cyl, Automatic 6-spd, 4WD
This 2021 GMC Sierra 4WD (5.3L 8-cyl, Automatic 6-spd, 4WD) takes regular (87-octane) gasoline. REGULAR
16
MPG combined (14 city / 20 hwy)
$3,900
est. fuel cost / year (EPA, 15k mi)
560 g/mi
tailpipe CO₂
Other 2021 GMC Sierra 4WD trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 5.3L 8-cyl, Automatic 10-spd, 4WD | REGULAR | 19 | $3,300 |
| 2.7L 4-cyl, Automatic 8-spd, 4WD | REGULAR | 19 | $3,300 |
| 2.7L 4-cyl, Automatic 8-spd, 4WD | REGULAR | 19 | $3,300 |
| 5.3L 8-cyl, Automatic 8-spd, 4WD | REGULAR | 18 | $3,450 |
| 5.3L 8-cyl, Automatic 10-spd, 4WD | REGULAR | 18 | $3,450 |
| 5.3L 8-cyl, Automatic 6-spd, 4WD | REGULAR | 17 | $3,650 |
| 4.3L 6-cyl, Automatic 6-spd, 4WD | REGULAR | 17 | $3,650 |
| 5.3L 8-cyl, Automatic 8-spd, 4WD | REGULAR | 16 | $3,900 |
| 3.0L 6-cyl, Automatic 10-spd, 4WD | DIESEL | 24 | $3,250 |
| 5.3L 8-cyl, Automatic 6-spd, 4WD | FLEX-FUEL | 16 | $3,900 |
| 6.2L 8-cyl, Automatic 10-spd, 4WD | PREMIUM | 17 | $4,550 |
| 6.2L 8-cyl, Automatic 10-spd, 4WD | PREMIUM | 16 | $4,800 |
EPA fuel type: Regular · class: Standard Pickup Trucks 4WD · retrieved 2026-06-14.