2009 · Midsize Car · Gas

2009 Cadillac STS MPG & fuel economy

The 2009 Cadillac STS is a midsize car offered in 4 EPA-rated configurations. The most efficient version returns 20 MPG combined (17 city / 26 highway) on regular gasoline. Across the lineup, combined ratings range from 17 to 20 MPG. Efficiency is unchanged from the 2008 model. Among 43 midsize cars rated for 2009, it ranks 25th for lowest fuel cost. At 15,000 miles a year with $3.10/gal regular gas, it costs about $2,325 a year to fuel.

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Combined 20 MPG 17 MPG city · 26 MPG hwy
Driving range — not published for this model
Your fuel cost $2,325 15,000 mi/yr · $15.50 per 100 mi
Class rank, 2009 #25 of 43 Midsize Cars by fuel cost

What will it cost you?

Your mileage and prices are saved and used across the site.

Fuel average

The 2009 Cadillac STS's fuel average is 8.5 km/L (11.8 L/100 km), or 20 MPG combined: 7.2 km/L in the city and 11.1 km/L on the highway.

MPGkm/LL/100 km
City177.213.8
Highway2611.19.0
Combined208.511.8

How it ranks among 2009 Midsize Cars

Full class ranking →
  1. 1Toyota Prius46 MPG $1,011
  2. 2Toyota Camry Hybrid34 MPG $1,368
  3. 3Nissan Altima Hybrid34 MPG $1,368
  4. 4Nissan Versa30 MPG $1,550
  5. 5Nissan Sentra29 MPG $1,603
  6. 25Cadillac STS20 MPG $2,325
  7. 43Bentley Continental Flying Spur12 MPG $4,938
2009 STSOther midsize carsClass median: $2,214/yr

Annual fuel cost at 15,000 miles and default prices; shorter bars cost less.

STS MPG across model years

Full history →

4 EPA-rated configurations

ConfigurationTypeCityHwyCombinedRangeYour cost / yr
RWD · 3.6L 6-cyl · 6-speed automatic
STS		 Gas 17 MPG 26 MPG 20 MPG — $2,325
4WD/AWD · 3.6L 6-cyl · 6-speed automatic
STS AWD		 Gas 17 MPG 26 MPG 20 MPG — $2,325
RWD · 4.6L 8-cyl · 6-speed automatic
STS		 Gas 15 MPG 24 MPG 18 MPG — $3,292
4WD/AWD · 4.6L 8-cyl · 6-speed automatic
STS AWD		 Gas 15 MPG 22 MPG 17 MPG — $3,485

Specs (most efficient configuration)

Fuel
Regular gasoline
Engine / motor
3.6L 6-cyl
Transmission
6-speed automatic
Drivetrain
RWD
Passenger volume
102 cu ft
Cargo volume
14 cu ft
Tailpipe CO₂
444 g/mi

2009 Cadillac STS vs. rivals

vs Volvo S80 20 MPG · $2,325/yr Same fuel cost vs Lincoln MKZ 21 MPG · $2,214/yr MKZ saves $111/yr vs Saab 9-5 21 MPG · $2,214/yr 9-5 saves $111/yr vs Mercedes-Benz E-Class Diesel 26 MPG · $2,135/yr E-Class Diesel saves $190/yr vs Lexus LS Hybrid 21 MPG · $2,821/yr STS saves $496/yr vs Lexus GS 22 MPG · $2,693/yr STS saves $368/yr

Compare the 2009 STS

With any other car from any year, including other STS model years. Type a year to jump, e.g. "2015 Accord".

Frequently asked questions

What is the gas mileage of the 2009 Cadillac STS?

Up to 20 MPG combined (17 city / 26 highway); ratings range from 17 to 20 MPG depending on configuration.

What fuel does the 2009 Cadillac STS use?

Regular gasoline.

What is the fuel average in km/L for the 2009 Cadillac STS?

The 2009 Cadillac STS's fuel average is 8.5 km/L (11.8 L/100 km), or 20 MPG combined: 7.2 km/L in the city and 11.1 km/L on the highway.

How much does it cost to fuel the 2009 Cadillac STS per year?

About $2,325 at 15,000 miles a year with $3.10/gal regular gas, or $15.50 per 100 miles. Use the calculator on this page to plug in your own mileage and prices.

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