2025 GMC Sierra 4WD At4X
19MPG
Combined
2
Trims
Updated February 27, 2026
The 2025 GMC Sierra 4WD At4X Truck diesel-powered provides 15–19 combined MPG depending on trim. We’ve compiled EPA fuel economy data, NHTSA safety ratings, and recall history so you can make an informed decision.
2025 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 | Diesel |
| Drive | 4WD |
| Available Trims | 2 |
Available Trims
| Trim | MPG (City/Hwy/Combined) | Engine | Transmission |
|---|---|---|---|
| Auto | 19/20/19 | 3.0L 6cyl | Automatic 10-spd |
| Auto | 14/16/15 | 6.2L 8cyl | Automatic 10-spd |
Annual Fuel Cost
Based on EPA estimates, the 2025 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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