2026 GMC Sierra fuel economy
The EPA lists 10 versions of the 2026 GMC Sierra. Combined fuel economy ranges from 15 to 25 MPG; the most efficient version is rated 23 city / 28 highway.
At a glance
- Combined
- 15 to 25 MPG depending on version
- City and highway
- 23 and 28 most efficient version
- Yearly fuel cost
- $3,850 EPA estimate, most efficient version
Source: U.S. EPA fueleconomy.gov
Every version the EPA tested
| Version | Engine | Drive | City | Highway | Combined | Yearly fuel cost |
|---|---|---|---|---|---|---|
| Sierra 2WD Automatic 10-spd | 6-cyl 3.0L | Rear-Wheel Drive | 23 | 28 | 25 MPG | $3,850 |
| Sierra 2WD Automatic 8-spd | 4-cyl 2.7L | Rear-Wheel Drive | 18 | 21 | 20 MPG | $3,350 |
| Sierra 4WD Automatic 8-spd | 4-cyl 2.7L | 4-Wheel Drive | 17 | 20 | 18 MPG | $3,700 |
| Sierra 2WD Automatic 10-spd | 8-cyl 5.3L | Rear-Wheel Drive | 16 | 20 | 17 MPG | $3,950 |
| Sierra 4WD FFV Automatic 10-spd | 8-cyl 5.3L FFV | 4-Wheel Drive | 15 | 19 | 17 MPG | $3,950 |
| Sierra 4WD Automatic 10-spd | 8-cyl 6.2L | 4-Wheel Drive | 15 | 19 | 16 MPG | $5,150 |
| Sierra 4WD Automatic 10-spd | 8-cyl 5.3L | 4-Wheel Drive | 15 | 18 | 16 MPG | $4,200 |
| Sierra Cab Chassis 2WD Automatic 10-spd | 8-cyl 5.3L | Rear-Wheel Drive | 15 | 18 | 16 MPG | $4,200 |
| Sierra 4WD AT4X Automatic 10-spd | 8-cyl 6.2L | 4-Wheel Drive | 14 | 16 | 15 MPG | $5,500 |
| Sierra Cab Chassis 4WD Automatic 10-spd | 8-cyl 5.3L | 4-Wheel Drive | 14 | 16 | 15 MPG | $4,450 |
At EPA assumptions, the most efficient version costs about $3,850 per year in fuel, versus $4,450 for the least efficient.