- Newest year: 2007
- Gas
- Midsize cars
2007 Cadillac STS MPG & Fuel Cost
4 configurations · 16–19 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, MY2007. Ranked against all rated configurations, not sales-weighted.
2007 Cadillac STS at a glance
The 2007 Cadillac STS has 4 configurations in the EPA database, rated 16–19 MPG combined. The most efficient is the STS 3.6L 6-cyl RWD at 19 MPG, which costs about $3,440 a year to fuel at regular gasoline $4.36/gal (U.S. average, Sep 2026). Annual fuel cost across the configurations runs from $3,440 to $5,020, a $1,580 difference. The STS 3.6L 6-cyl RWD costs less to fuel than 5 of 10 midsize car configurations rated for MY2007 (class median $3,650 a year).
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
What the 2007 STS 3.6L 6-cyl RWD costs to drive
Per month
$287
$3,440 a year ÷ 12
Per 25 miles
$5.73
Per 100 miles
$22.93
Five years
$17,200
5 × the yearly cost, prices held at today's level
vs the midsize car median
$210less a year
Class median $3,650 a year, MY2007
Based on 15,000 miles a year and regular gasoline $4.36/gal (U.S. average, Sep 2026).
2007 Cadillac STS MPG
EPA re-estimated ratings of 1985-2007 vehicles under its 2008 method; these figures are the re-estimated values.
Gas configurations (4)
| Trim | Engine | Drive | City | Hwy | Comb. | $/yr |
|---|---|---|---|---|---|---|
| STS 3.6L 6-cyl RWD (Most efficient) | 3.6L 6-cyl | RWD | 16 | 25 | 19 | $3,440 |
| STS 3.6L 6-cyl 4WD | 3.6L 6-cyl | 4WD | 16 | 23 | 18 | $3,630 |
| STS 4.6L 8-cyl RWD | 4.6L 8-cyl | RWD | 15 | 24 | 18 | $4,460 |
| STS 4.6L 8-cyl 4WD | 4.6L 8-cyl | 4WD | 14 | 21 | 16 | $5,020 |
2 configurations require or recommend higher-octane gasoline and are costed at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Fuel cost by state
Yearly cost of the STS 3.6L 6-cyl RWD: $4,680 in California and $3,000 in Texas, a $1,680 difference.
- California $4,680
- Washington $4,330
- New York $3,440
- Florida $3,250
- Texas $3,000
Similar cars
Closest combined MPG among MY2007 midsize car models.
Generations
Frequently asked questions
How does the 2007 Cadillac STS compare with the previous generation?
The previous generation (2005-2006 Cadillac STS) is rated 17–19 MPG combined and costs $3,440–$4,730 a year to fuel; the 2007 model is rated 16–19 MPG and costs $3,440–$5,020 a year.
What gas mileage does the 2007 Cadillac STS get?
EPA rates the 2007 Cadillac STS at 16–19 MPG combined across 4 configurations. The most efficient, the STS 3.6L 6-cyl RWD, is rated 19 MPG combined (16 city / 25 highway).
How much does it cost to fuel a 2007 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 $3,440 a year. Across all 4 configurations the cost runs $3,440–$5,020 a year. That is a $1,580 difference between the cheapest and the costliest configuration.
How much does it cost to drive a 2007 Cadillac STS 100 miles?
About $22.93 per 100 miles for the STS 3.6L 6-cyl RWD at regular gasoline $4.36/gal (U.S. average, Sep 2026), and between $22.93 and $33.47 across all configurations. That is the annual cost over 15,000 miles divided by 150.
Is the 2007 Cadillac STS more efficient in the city or on the highway?
The STS 3.6L 6-cyl RWD is rated 16 city and 25 highway MPG, so it is more efficient on the highway, by 9 MPG.
How does the 2007 Cadillac STS compare with other midsize car configurations?
The STS 3.6L 6-cyl RWD costs about $3,440 a year to fuel, $210 less than the class median of $3,650, and less than 5 of 10 midsize car configurations. The comparison covers all 152 rated midsize car configurations for MY2007, not weighted by sales.
Is the 2007 Cadillac STS different from the 2006 model?
The most efficient configuration stays at 19 MPG. Its annual cost stays at $3,440. EPA lists 4 configurations for 2007 against 4 configurations for 2006. See the 2006 Cadillac STS for that year.