- Newest year: 2011
- Gas
- Midsize cars
2010-2011 Cadillac STS MPG & Fuel Cost
2 model years · 17–21 MPG combined
15,000 mi/yr · regular gasoline $4.36/gal (U.S. average, Sep 2026)
Cheaper to fuel than 5 of 10 midsize car configurations, MY2011. Ranked against all rated configurations, not sales-weighted.
2010-2011 Cadillac STS at a glance
The 2010-2011 Cadillac STS covers 2 model years in the EPA database (6 configurations in all), rated 17–21 MPG combined. The newest model year, 2011, costs about $3,110 a year to fuel for its most efficient version, the STS 3.6L 6-cyl RWD (21 MPG), at regular gasoline $4.36/gal (U.S. average, Sep 2026). EPA changed the ratings in 2011.
2010-2011 Cadillac STS by model year
What the 2011 STS 3.6L 6-cyl RWD costs to drive
Per month
$259
$3,110 a year ÷ 12
Per 25 miles
$5.18
Per 100 miles
$20.73
Five years
$15,550
5 × the yearly cost, prices held at today's level
vs the midsize car median
Same
Class median $3,110 a year, MY2011
Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).
2011 Cadillac STS MPG
Versus 2010: The most efficient configuration stays at 21 MPG. Its annual cost stays at $3,110.
Gas configurations (2)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| STS 3.6L 6-cyl RWD (Most efficient) | 3.6L 6-cyl | RWD | 18 | 27 | 21 | $3,110 |
| STS 3.6L 6-cyl AWD | 3.6L 6-cyl | AWD | 18 | 26 | 21 | $3,130 |
2010 Cadillac STS MPG
17–21 MPG · $3,110–$3,840/yr
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| STS 3.6L 6-cyl RWD (Most efficient) | 3.6L 6-cyl | RWD | 18 | 27 | 21 | $3,110 |
| STS 3.6L 6-cyl AWD | 3.6L 6-cyl | AWD | 18 | 27 | 21 | $3,110 |
| STS 4.6L 8-cyl RWD | 4.6L 8-cyl | RWD | 15 | 24 | 18 | $3,630 |
| STS 4.6L 8-cyl AWD | 4.6L 8-cyl | AWD | 15 | 22 | 17 | $3,840 |
Fuel cost by state
Yearly cost of the STS 3.6L 6-cyl RWD: $4,230 in California and $2,710 in Texas, a $1,520 difference.
- California $4,230
- Washington $3,920
- New York $3,110
- Florida $2,940
- Texas $2,710
Similar cars
Closest combined MPG among MY2011 midsize car models.
Generations
Frequently asked questions
What gas mileage does the 2010-2011 Cadillac STS get?
EPA rates the 2010-2011 Cadillac STS at 17–21 MPG combined across 6 configurations and 2 model years. The most efficient version, the 2011 STS 3.6L 6-cyl RWD, is rated 21 MPG (18 city, 27 highway).
Which years had the best MPG in the 2010-2011 Cadillac STS?
Every model year of the 2010-2011 Cadillac STS tops out at 21 MPG combined, so no year is better than another.
Did EPA ratings change during the 2010-2011 Cadillac STS?
Yes. Ratings changed in 2011.
How does the 2010-2011 Cadillac STS compare with the previous generation?
The previous generation (2008-2009 Cadillac STS) is rated 16–20 MPG combined and costs $3,270–$5,020 a year to fuel; the 2010-2011 model is rated 17–21 MPG and costs $3,110–$3,840 a year.
How much does it cost to fuel a 2011 Cadillac STS per year?
Driving 15,000 miles a year at regular gasoline $4.36/gal (U.S. average, Sep 2026), the STS 3.6L 6-cyl RWD costs about $3,110 a year. Across all 2 configurations the cost runs $3,110–$3,130 a year. That is a $20 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2011 Cadillac STS 100 miles?
About $20.73 per 100 miles for the STS 3.6L 6-cyl RWD at regular gasoline $4.36/gal (U.S. average, Sep 2026), and between $20.73 and $20.87 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2011 Cadillac STS more efficient in the city or on the highway?
The STS 3.6L 6-cyl RWD is rated 18 city and 27 highway MPG, so it is more efficient on the highway, by 9 MPG.
How does the 2011 Cadillac STS compare with other midsize car configurations?
The STS 3.6L 6-cyl RWD costs about $3,110 a year to fuel, the same as the class median of $3,110, and less than 5 of 10 midsize car configurations. The comparison covers all 159 rated midsize car configurations for MY2011, not weighted by sales.
Is the 2011 Cadillac STS different from the 2010 model?
The most efficient configuration stays at 21 MPG. Its annual cost stays at $3,110. EPA lists 2 configurations for 2011 against 4 configurations for 2010. See the 2010 Cadillac STS for that year.