2026 GMC Sierra: Sierra 4WD with Sport Mode · 5.3L · 4WD · 10-speed automatic
One configuration of the 2026 GMC Sierra as listed by our sources.
Configuration specifications| Engine | 5.3L 8-cylinder (SIDI) |
|---|
| Displacement | 5.3 L |
|---|
| Cylinders | 8 |
|---|
| Fuel type | Gasoline |
|---|
| Transmission | 10-speed automatic |
|---|
| Drivetrain | 4WD |
|---|
| Combined economy | 17 mpg (13.8 L/100 km) |
|---|
| City economy | 15 mpg (15.7 L/100 km) |
|---|
| Highway economy | 19 mpg (12.4 L/100 km) |
|---|