2026 GMC Sierra: Sierra 4WD · 2.7L · 4WD · 8-speed automatic
One configuration of the 2026 GMC Sierra as listed by our sources.
| Engine | 2.7L 4-cylinder turbocharged (SIDI) |
|---|---|
| Displacement | 2.7 L |
| Cylinders | 4 |
| Fuel type | Gasoline |
| Transmission | 8-speed automatic |
| Drivetrain | 4WD |
| Combined economy | 18 mpg (13.1 L/100 km) |
| City economy | 17 mpg (13.8 L/100 km) |
| Highway economy | 20 mpg (11.8 L/100 km) |