2026 GMC Sierra
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
- Fuel economy
- 15 to 25 MPG combined
Sources: NHTSA complaints, recalls and 5-Star ratings; U.S. EPA
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.