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Mercedes-Benz CLS-Class Fuel Economy (MPG)

What is the real-world gas mileage of a 2023 Mercedes-Benz CLS-Class?

The 2023 Mercedes-Benz CLS-Class gets up to 26 MPG combined (23 city / 30 highway) in EPA testing.

Latest model year (2023):

The Mercedes-Benz CLS-Class gets up to 25 MPG combined (22 city / 30 highway) in the Auto 9-spd, 6 cyl, 3.0 L trim.

Verifiedfueleconomy.gov · Verified August 9, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceDimensionsCurb Weight

Mercedes-Benz CLS-Class MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2023Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline223025
2022Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline223025
2021Config 1 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline212623
2021Config 2 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline233026
2021Config 3 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline222925
2020Config 1 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline233026
2020Config 2 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline212723
2020Config 3 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline243126
2019Config 1 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline212723
2019Config 2 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline243126
2019Config 3 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline233026
2018Config 1 of 3Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162218
2018Config 2 of 3Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2018Config 3 of 3Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline182621
2017Config 1 of 3Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162218
2017Config 2 of 3Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline182621
2017Config 3 of 3Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2016Config 1 of 5Auto 7-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline192622
2016Config 2 of 5Auto 7-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline203024
2016Config 3 of 5Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162218
2016Config 4 of 5Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2016Config 5 of 5Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline182620
2015Config 1 of 5Auto 7-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline192622
2015Config 2 of 5Auto 7-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202924
2015Config 3 of 5Auto 7-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172419
2015Config 4 of 5Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162218
2015Config 5 of 5Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline182620

Data sourced from fueleconomy.gov (U.S. Department of Energy). MPG figures are EPA-tested. Fuel costs are estimates based on average fuel prices and 15,000 miles/year.

Mercedes-Benz CLS-Class data analysis

How Mercedes-Benz CLS-Class combined fuel economy varies

Across 27 configurations recorded for the 2015 through 2023 Mercedes-Benz CLS-Class, combined fuel economy runs from 18 MPG to 26 MPG. The strongest figure belongs to the 2019 Mercedes-Benz CLS-Class (Auto 9-spd, 6 cyl, 3.0 L) at 26 MPG, and the weakest to the 2018 car (Auto 7-spd, 8 cyl, 5.5 L) at 18 MPG — a spread of 44%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the Mercedes-Benz CLS-Class would be misleading.

What changed for 2023

Average combined fuel economy for the 2023 Mercedes-Benz CLS-Class is 25 MPG, against 25 MPG for the 2022 car — it held flat. A carry-over year like this usually means no powertrain or structural change, so an older example is the cheaper way into the same specification.

How to read this Mercedes-Benz CLS-Class data

This page lists every 2015 through 2023 Mercedes-Benz CLS-Class record we hold for this measurement — 27 rows in total, one per configuration and model year rather than a single headline figure. Figures are published as the source agency records them: we do not round, average or interpolate missing years, and a year that is absent from the table is a year with no published measurement rather than a zero. Where a manufacturer offered several drivetrains or body styles in the same year, each appears on its own row, because those variants rarely share the same numbers.

Configurations behind these Mercedes-Benz CLS-Class numbers

The 2015 through 2023 Mercedes-Benz CLS-Class entries here cover the variants Auto 9-spd, 6 cyl, 3.0 L, Auto 7-spd, 8 cyl, 5.5 L, Auto 9-spd, 8 cyl, 4.7 L, Auto 7-spd, 6 cyl, 3.0 L and Auto 7-spd, 8 cyl, 4.7 L. 2016 is the busiest model year in the record with 5 separate measured configurations, which is why a single quoted combined fuel economy figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.

Where these Mercedes-Benz CLS-Class figures come from

Every value on this page is loaded from federal open data — EPA fuel economy submissions, NHTSA vehicle and crash-test records, and manufacturer specification filings — rather than dealer listings or copied editorial content. The Mercedes-Benz CLS-Class record refreshes as the agencies publish, which typically means new model-year rows appear in the autumn and crash-test results follow through the model year as vehicles are tested. Because certification data is filed per configuration, treat any single headline number for this vehicle with caution: the figure that applies to a specific car depends on its engine, drivetrain, body style and model year, all of which are listed separately above. If a number here disagrees with a brochure, the brochure is usually quoting the best available configuration rather than the one being sold.

Official Factory Specs vs. AutoSpecData Expert Benchmarks

The EPA highway loop never holds interstate speed. Here is what the same engine does when you sit on the cruise control.

Cruise speedEPA highway specAutoSpecData adjusted MPGFuel you lose
60 mph31 MPG31 MPG0%
65 mph31 MPG28.9 MPG7%
70 mph31 MPG26.9 MPG13%
75 mph31 MPG25.1 MPG19%
80 mph31 MPG23.4 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Mercedes-Benz CLS-Class EPA highway result with a quadratic drag term (mpg = hwy ÷ (1 + k·(v² − 60²)/60²), k = 0.55 for trucks, SUVs and vans, 0.42 for cars). Wind, roof racks, and a heavy right foot make it worse, never better.

Frequently Asked Questions About CLS-Class MPG

What is the MPG of the Mercedes-Benz CLS-Class?

The Mercedes-Benz CLS-Class gets up to 26 MPG combined (23 city / 30 highway) in the 2023 model year. Fuel economy varies by engine and trim — see the full table above for details.

Which Mercedes-Benz CLS-Class trim has the best fuel economy?

The Auto 9-spd, 6 cyl, 3.0 L trim offers the best combined fuel economy at 26 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

View full Mercedes-Benz CLS-Class specs

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