1991 GMC Sierra 2500
The EPA rates the 1991 GMC Sierra 2500 at 18 MPG combined (17 city / 21 highway).
At a glance
- Fuel economy
- 18 MPG combined
Sources: NHTSA complaints, recalls and 5-Star ratings; U.S. EPA
Fuel economy
The EPA rates the 1991 GMC Sierra 2500 at 18 MPG combined (17 city / 21 highway).