Cadillac STS MPG by Year & Engine (EPA)
EPA fuel-economy ratings for every rated Cadillac STS model year from 2005 to 2011 — each engine and transmission with its official city, highway and combined figures. Over these years the STS has been offered with 3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl engines; the most efficient version is the 2011 (up to 21 MPG combined). Data: U.S. Department of Energy & EPA, fueleconomy.gov; prices are live medians from VehiSales listings.
Cadillac STS fuel economy by year
| Year | Combined | Engines | Median used price | For sale |
|---|---|---|---|---|
| 2011 | 21 MPG | 3.6L 6-cyl | — | — |
| 2010 | 17–21 MPG | 3.6L 6-cyl, 4.6L 8-cyl | — | — |
| 2009 | 15–20 MPG | 3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl | — | — |
| 2008 | 15–20 MPG | 3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl | — | — |
| 2007 | 15–19 MPG | 3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl | — | — |
| 2006 | 14–19 MPG | 3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl | — | — |
| 2005 | 17–18 MPG | 4.6L 8-cyl, 3.6L 6-cyl | — | — |
2011 Cadillac STS: engines & MPG
The 2011 STS was EPA-rated in 2 versions (3.6L 6-cyl), with combined economy of 21 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS AWD | 3.6L 6-cyl | Automatic (S6) | Regular | 18 | 26 | 21 MPG |
| STS | 3.6L 6-cyl | Automatic (S6) | Regular | 18 | 27 | 21 MPG |
2010 Cadillac STS: engines & MPG
The 2010 STS was EPA-rated in 4 versions (3.6L 6-cyl, 4.6L 8-cyl), with combined economy from 17 to 21 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS AWD | 3.6L 6-cyl | Automatic (S6) | Regular | 18 | 27 | 21 MPG |
| STS | 3.6L 6-cyl | Automatic (S6) | Regular | 18 | 27 | 21 MPG |
| STS | 4.6L 8-cyl | Automatic (S6) | Regular | 15 | 24 | 18 MPG |
| STS AWD | 4.6L 8-cyl | Automatic (S6) | Regular | 15 | 22 | 17 MPG |
2009 Cadillac STS: engines & MPG
The 2009 STS was EPA-rated in 5 versions (3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl), with combined economy from 15 to 20 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS AWD | 3.6L 6-cyl | Automatic (S6) | Regular | 17 | 26 | 20 MPG |
| STS | 3.6L 6-cyl | Automatic (S6) | Regular | 17 | 26 | 20 MPG |
| STS | 4.6L 8-cyl | Automatic (S6) | Premium | 15 | 24 | 18 MPG |
| STS AWD | 4.6L 8-cyl | Automatic (S6) | Premium | 15 | 22 | 17 MPG |
| STS-V | 4.4L 8-cyl | Automatic (S6) | Premium | 13 | 19 | 15 MPG |
2008 Cadillac STS: engines & MPG
The 2008 STS was EPA-rated in 5 versions (3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl), with combined economy from 15 to 20 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS AWD | 3.6L 6-cyl | Automatic (S6) | Regular | 17 | 26 | 20 MPG |
| STS | 3.6L 6-cyl | Automatic (S6) | Regular | 17 | 26 | 20 MPG |
| STS | 4.6L 8-cyl | Automatic (S6) | Premium | 15 | 24 | 18 MPG |
| STS AWD | 4.6L 8-cyl | Automatic (S6) | Premium | 14 | 21 | 16 MPG |
| STS-V | 4.4L 8-cyl | Automatic (S6) | Premium | 13 | 19 | 15 MPG |
2007 Cadillac STS: engines & MPG
The 2007 STS was EPA-rated in 5 versions (3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl), with combined economy from 15 to 19 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS | 3.6L 6-cyl | Automatic (S5) | Regular | 16 | 25 | 19 MPG |
| STS AWD | 3.6L 6-cyl | Automatic (S5) | Regular | 16 | 23 | 18 MPG |
| STS | 4.6L 8-cyl | Automatic (S6) | Premium | 15 | 24 | 18 MPG |
| STS | 4.6L 8-cyl | Automatic (S6) | Premium | 14 | 21 | 16 MPG |
| STS-V | 4.4L 8-cyl | Automatic (S6) | Premium | 12 | 19 | 15 MPG |
2006 Cadillac STS: engines & MPG
The 2006 STS was EPA-rated in 5 versions (3.6L 6-cyl, 4.6L 8-cyl, 4.4L 8-cyl), with combined economy from 14 to 19 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS | 3.6L 6-cyl | Automatic (S5) | Regular | 16 | 25 | 19 MPG |
| STS | 4.6L 8-cyl | Automatic (S5) | Premium | 15 | 24 | 18 MPG |
| STS AWD | 3.6L 6-cyl | Automatic (S5) | Regular | 15 | 23 | 18 MPG |
| STS AWD | 4.6L 8-cyl | Automatic (S5) | Premium | 14 | 21 | 17 MPG |
| STS-V | 4.4L 8-cyl | Automatic (S6) | Premium | 12 | 19 | 14 MPG |
2005 Cadillac STS: engines & MPG
The 2005 STS was EPA-rated in 3 versions (4.6L 8-cyl, 3.6L 6-cyl), with combined economy from 17 to 18 MPG.
| Version | Engine | Transmission | Fuel | City | Hwy | Combined |
|---|---|---|---|---|---|---|
| STS 2WD | 4.6L 8-cyl | Automatic (S5) | Premium | 15 | 23 | 18 MPG |
| STS 2WD | 3.6L 6-cyl | Automatic (S5) | Regular | 16 | 23 | 18 MPG |
| STS AWD | 4.6L 8-cyl | Automatic (S5) | Premium | 14 | 21 | 17 MPG |
Frequently asked questions
What MPG does a Cadillac STS get?
Depending on year and engine, EPA combined ratings for the STS range from 18 to 21 MPG. The most efficient rated version is the 2011 model year.
What engines does the 2011 Cadillac STS have?
The 2011 STS was EPA-rated with 3.6L 6-cyl engines — see the 2011 table above for each version's exact city/highway figures.
Does the Cadillac STS require premium gas?
Some versions do: EPA lists regular gasoline and premium gasoline depending on year and engine — check your year's table above.
https://vehisales.com/research/fuel-economy/cadillac/sts.
See also: Cadillac STS hub — live listings, prices & reliability · Most fuel-efficient cars by segment · Model price trends. Media inquiries: [email protected].