Cadillac STS MPG by model year
Combined EPA ratings for each Cadillac STS model year. Years with identical ratings are grouped together.
| Model year | Combined MPG | Best hwy | Versions |
|---|---|---|---|
| 2011 | 21 MPG | 27 | 2 |
| 2010 | 17–21 MPG | 27 | 4 |
| 2009 | 17–20 MPG | 26 | 4 |
| 2008 | 16–20 MPG | 26 | 4 |
| 2007 | 16–19 MPG | 25 | 4 |
| 2006 | 17–19 MPG | 25 | 4 |
| 2005 | 17–18 MPG | 23 | 3 |
Model years before 2005 are listed for reference without a separate page.
Source: U.S. Environmental Protection Agency and U.S. Department of Energy, fueleconomy.gov. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.