GMC
Sierra 4WD AT4X with Sport Mode
U.S. fuel economy and specifications from the EPA.
19Best combined MPG2026 model year
2026Model years1 with EPA ratings
1Rated configurationDrive, transmission and engine
3 LEngine sizeDisplacement
1 configuration.
4-Wheel Drive · Automatic 10-spd
Diesel · Standard Pickup Trucks 4WD
- Combined MPG
- 19
- Engine displacement
- 3.0 L
- Cylinders
- 6