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2026 GMC Sierra 4WD AT4X — 3.0L 6-cyl, Automatic 10-spd, 4WD
This 2026 GMC Sierra 4WD AT4X (3.0L 6-cyl, Automatic 10-spd, 4WD) runs on diesel. DIESEL
19
MPG combined (19 city / 20 hwy)
$4,100
est. fuel cost / year (EPA, 15k mi)
524 g/mi
tailpipe CO₂
Other 2026 GMC Sierra 4WD AT4X trims
| Trim | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 6.2L 8-cyl, Automatic 10-spd, 4WD | PREMIUM | 15 | $5,150 |
EPA fuel type: Diesel · class: Standard Pickup Trucks 4WD · retrieved 2026-06-14.