2026 GMC Sierra 4WD At4X
19MPG
Combined
2
Trims
← 2025
2026
Updated February 27, 2026
Get the full picture on the 2026 GMC Sierra 4WD At4X. As a Truck, it achieves 15–19 combined MPG depending on trim and has not yet been rated by NHTSA. Below you’ll find detailed specs for every trim, plus recall information and competitor comparisons.
2026 GMC Sierra 4WD At4X Specifications
| Spec | Value |
|---|---|
| Combined MPG | 15–19 combined MPG depending on trim |
| City MPG | 19 |
| Highway MPG | 20 |
| Body Style | Truck |
| Fuel Type | Premium |
| Drive | 4WD |
| Available Trims | 2 |
Available Trims
| Trim | MPG (City/Hwy/Combined) | Engine | Transmission |
|---|---|---|---|
| Auto | 14/16/15 | 6.2L 8cyl | Automatic 10-spd |
| Auto | 19/20/19 | 3.0L 6cyl | Automatic 10-spd |
Annual Fuel Cost
Based on EPA estimates, the 2026 GMC Sierra 4WD At4X costs approximately $3,400 per year in fuel. This assumes 15,000 miles driven annually and current fuel prices.
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