2009 Cadillac STS
The EPA lists 4 versions of the 2009 Cadillac STS. Combined fuel economy ranges from 17 to 20 MPG; the most efficient version is rated 17 city / 26 highway.
At a glance
- Fuel economy
- 17 to 20 MPG combined
Sources: NHTSA complaints, recalls and 5-Star ratings; U.S. EPA
Fuel economy
The EPA lists 4 versions of the 2009 Cadillac STS. Combined fuel economy ranges from 17 to 20 MPG; the most efficient version is rated 17 city / 26 highway.