← all 2021 GMC Sierra Cab Chassis 2WD trims
2021 GMC Sierra Cab Chassis 2WD — 4.3L 6-cyl, Automatic 6-spd, RWD
This 2021 GMC Sierra Cab Chassis 2WD (4.3L 6-cyl, Automatic 6-spd, RWD) takes regular (87-octane) gasoline. REGULAR
17
MPG combined (15 city / 19 hwy)
$3,353
est. fuel cost / year (today’s prices, 15k mi)
523 g/mi
tailpipe CO₂
At today's AAA national average price ($3.80/gal, 2026-07-05) — the EPA's own price/date assumption isn't exposed in the public dataset, so we recompute this from the EPA's MPG figure and a sourced current price.
Other 2021 GMC Sierra Cab Chassis 2WD trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 5.3L 8-cyl, Automatic 6-spd, RWD | REGULAR | 15 | $3,800 |
| 5.3L 8-cyl, Automatic 6-spd, RWD | REGULAR | 14 | $4,071 |
EPA fuel type: Regular · class: Special Purpose Vehicle 2WD · engine: 4.3L 6-cyl · transmission: Automatic 6-spd · drive: RWD · MPG retrieved 2026-07-24.