Cadillac STS MPG by year — every rating on record

The Cadillac STS has a combined EPA fuel economy rating for 7 model years, from 2005 to 2011. Across those years its best rated version returned 21 mpg (2010) and its thirstiest returned 16 mpg (2007). The EPA record holds 25 configurations for this nameplate, most recently a Midsize Cars.

Year-by-year EPA ratings

Where it has stood in its class

Ranked against every other nameplate the EPA filed under the same class that year. The Cadillac STS placed highest in 2010 at #36 of 63, and lowest in 2005 at #46 of 56. It spent 0 of its 7 ranked years in the top half of its class.

Every configuration on record

All 25 configurations EPA lists for this nameplate, newest first.

How the rating has moved between model years

Comparing the best-rated configuration of each year. 3 of 3 year-over-year steps improved the top rating.

What STS fuel costs over a year

At the EPA's 11,500 miles a year, the 2011 Cadillac STS burns 548 to 548 gallons depending on configuration. Below is what that costs at three pump prices, and how much more the thirstiest configuration costs than the most efficient one.

EPA’s own estimate for the 2011 model year is $2,950 to $2,950 a year in fuel, or $3,500 more than the average new vehicle over five years.

How it compares with other Midsize Cars

Across the 483 nameplates EPA classifies as Midsize Cars, the median best combined rating is 25 mpg. At 21 mpg the Cadillac STS is 4 mpg below the median, which is worth about $307 a year at $3.50 a gallon.

• All Midsize Cars rankings — every nameplate in the class, best to worst.

Other Cadillac nameplates

Every Cadillac model compared → — all nameplates ranked by best combined rating, with what each one costs a year.