GMC
Sierra 4WD with Sport Mode
U.S. fuel economy and specifications from the EPA.
24Best combined MPG2026 model year
2026Model years1 with EPA ratings
3Rated configurationsDrive, transmission and engine
2.7–5.3 LEngine sizeDisplacement
3 configurations.
4-Wheel Drive · Automatic 8-spd
Regular gasoline · Standard Pickup Trucks 4WD
- Combined MPG
- 17
- Engine displacement
- 2.7 L
- Cylinders
- 4
4-Wheel Drive · Automatic 10-spd
Regular gasoline · Standard Pickup Trucks 4WD
- Combined MPG
- 17
- Engine displacement
- 5.3 L
- Cylinders
- 8
4-Wheel Drive · Automatic 10-spd
Diesel · Standard Pickup Trucks 4WD
- Combined MPG
- 24
- Engine displacement
- 3.0 L
- Cylinders
- 6