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Mercedes-Benz CLK-Class MPG

The 2009 Mercedes-Benz CLK-Class gets 18.5 mpg combined (16 city, 23.5 highway): about $2,076 a year in fuel at $3.20 a gallon and 12,000 miles. Its 2 versions that year range from 17 to 20 mpg.

EPA fueleconomy.gov · 5 engines · 1998–2009 · Updated Nov 4, 2026
Quick answer

Against 469 other V6 cars rated 2007–2009, the CLK-Class trails their 19.5 mpg average by 1 mpg, about $107 a year. Averaged over the years each was sold, the most economical engine since 1998, the 3.2L 6-cyl (1998–2005), does 20.8 mpg and the thirstiest, the 5.5L 8-cyl (2007–2009), 17: $413 a year apart.

Every Mercedes-Benz CLK-Class engine, compared

Yearly cost assumes 12,000 miles at $3.20 a gallon.

FIG.01·Mercedes-Benz CLK-Class gas mileage by engine
EngineCombinedCity / HighwayYearsFuel per year
3.2L 6-cyl20.818 / 25.51998–2005$1,846
3.5L 6-cyl2017 / 25.32006–2009$1,920
4.3L 8-cyl18.616 / 22.61999–2003$2,065
5L 8-cyl17.715 / 22.32004–2006$2,169
5.5L 8-cyl1715 / 222007–2009$2,259
ROWS 5·SOURCE EPA fueleconomy.gov + ForCar

What that actually costs

FIG.02·Mercedes-Benz CLK-Class fuel cost
MeasureValue
Cost per mile (2009)$0.173
Fuel per year$2,076
Fuel over five years$10,380
Against other V6 cars, 2007–2009+$107 a year
EPA's own estimate$4,026 a year
ROWS 5·SOURCE ForCar, computed from EPA ratings

City or highway — who is this car for

The 2009 Mercedes-Benz CLK-Class gives up 7.5 mpg in town: 23.5 on the highway against 16 in the city, $766 a year if every mile were city driving.

FIG.03·Mercedes-Benz CLK-Class city versus highway
MeasureValueReading
City (2009)16 mpg$2,400 a year if you only drive in town
Highway23.5 mpg$1,634 a year if you mostly commute
Gap+7.5 mpg (47%)Wide — this car dislikes traffic
ROWS 3·SOURCE EPA fueleconomy.gov + ForCar

How the CLK-Class changed over the years

The CLK-Class peaked in 1998 at 22 mpg (19 city, 27 highway) and was at its thirstiest in 2009 at 18.5 — 3.5 mpg apart, or $331 a year in fuel between buying one year and the other. The 2009 car does 18.5.

FIG.04·Mercedes-Benz CLK-Class gas mileage by model year
Model yearCombinedCity / HighwayEngines offeredFuel per year
200918.516 / 23.52$2,076
200818.516 / 23.52$2,076
200718.516 / 23.52$2,076
20061916 / 24.52$2,021
200519.516.5 / 24.52$1,969
200418.516.5 / 22.52$2,076
20031916.5 / 232$2,021
20021917 / 23.52$2,021
20012017 / 24.52$1,920
20002017 / 24.52$1,920
19992017 / 24.52$1,920
19982219 / 271$1,745
ROWS 12·SOURCE EPA fueleconomy.gov + ForCar
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How we count

This page rests on 23 EPA ratings of the Mercedes-Benz CLK-Class — 5 engines across 1998–2009. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $4,026. Full method.

Everything on the Mercedes-Benz CLK-Class
Recalls32 campaignsReliability4.0/5Common problems268 complaintsCheck a VINAgainst this exact buildUsed prices685 listingsWhat yours is worthValue by year & mileageWindow stickerOriginal Monroney labelDecode a VINWhat each character meansAbout this car1998–2009

Frequently asked questions

What mpg does the 2009 Mercedes-Benz CLK-Class get?

18.5 mpg combined, 16 city and 23.5 highway, per EPA; its 2 versions that year range from 17 to 20. Across every year since 1998 the CLK-Class has averaged 19.3 mpg.

Is the 2009 CLK-Class more efficient than the 2008?

About the same: 18.5 against 18.5 mpg combined.

Which CLK-Class year has the best gas mileage?

The 1998, at 22 mpg combined (19 city, 27 highway).

Gas mileage ratings from EPA fueleconomy.gov, unadjusted. Running cost computed by ForCar at 12,000 miles a year and $3.20 a gallon. Last updated Nov 2026. — ForCar Reviewed by , founder of ForCar.
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