Cadillac · 2005–2011 · Gas
Cadillac STS MPG by year
The EPA has rated 7 model years of the Cadillac STS, from 2005 to 2011. The most fuel-efficient year is the 2011, at 21 MPG combined in its best configuration. The best 2011 model is 17% more efficient than the best 2005 model (21 vs. 18 MPG). The 2011 model is 12% less efficient than the median midsize car that year (21 vs. 24 MPG).
Combined MPG by model year
- STS, most efficient version
- Range across configurations
- Class median
Shaded band: range across that year's configurations. Class median: same-year models in the same class, rated in MPG. Click a point to open that model year; the table below lists every value.
Every STS model year
| Year | Type | Best combined | City / Hwy | Class median | Range | Configs | Fuel / yr |
|---|---|---|---|---|---|---|---|
| 2011 | Gas | 21 MPG | 18 / 27 | 24 | — | 2 | $2,214 |
| 2010 | Gas | 21 MPG lowest 17 |
18 / 27 | 22 | — | 4 | $2,214 |
| 2009 | Gas | 20 MPG lowest 17 |
17 / 26 | 22 | — | 4 | $2,325 |
| 2008 | Gas | 20 MPG lowest 16 |
17 / 26 | 22 | — | 4 | $2,325 |
| 2007 | Gas | 19 MPG lowest 16 |
16 / 25 | 22 | — | 4 | $2,447 |
| 2006 | Gas | 19 MPG lowest 17 |
16 / 25 | 21 | — | 4 | $2,447 |
| 2005 | Gas | 18 MPG lowest 17 |
16 / 23 | 21 | — | 3 | $2,583 |
Fuel cost uses today's default prices for every year so model years compare like for like. Sort any column.
Compare STS model years
See how much a newer STS would save over an older one.
Models similar to the Cadillac STS
Frequently asked questions
Which Cadillac STS year has the best fuel economy?
The 2010 Cadillac STS, rated up to 21 MPG combined. At 15,000 miles a year with $3.10/gal regular gas, that works out to about $2,214 a year.
Which Cadillac STS year has the worst fuel economy?
The 2005 model, whose most efficient version is rated 18 MPG combined (about $2,583 a year to fuel).
What is the fuel economy of the latest Cadillac STS?
The 2011 Cadillac STS is rated up to 21 MPG combined.