2009 Cadillac STS 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.
At a glance
- Combined
- 17 to 20 MPG depending on version
- City and highway
- 17 and 26 most efficient version
- Yearly fuel cost
- $3,350 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 |
|---|---|---|---|---|---|---|
| STS Automatic (S6) | 6-cyl 3.6L | Rear-Wheel Drive | 17 | 26 | 20 MPG | $3,350 |
| STS AWD Automatic (S6) | 6-cyl 3.6L | 4-Wheel or All-Wheel Drive | 17 | 26 | 20 MPG | $3,350 |
| STS Automatic (S6) | 8-cyl 4.6L | Rear-Wheel Drive | 15 | 24 | 18 MPG | $4,550 |
| STS AWD Automatic (S6) | 8-cyl 4.6L | 4-Wheel or All-Wheel Drive | 15 | 22 | 17 MPG | $4,850 |
At EPA assumptions, the most efficient version costs about $3,350 per year in fuel, versus $4,850 for the least efficient.