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Mercedes-Benz SL-Class Fuel Economy (MPG)

What is the real-world gas mileage of a 2027 Mercedes-Benz SL-Class?

The 2027 Mercedes-Benz SL-Class gets up to 23 MPG combined (21 city / 27 highway) in EPA testing.

Latest model year (2027):

The Mercedes-Benz SL-Class gets up to 16 MPG combined (14 city / 21 highway) in the Auto 9-spd, 8 cyl, 4.0 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenanceDimensionsCurb WeightEV Range

Mercedes-Benz SL-Class MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2027Config 1 of 2Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142116
2027Config 2 of 2Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline132016
2026Config 1 of 3Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline192722
2026Config 2 of 3Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline132016
2026Config 3 of 3Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142116
2025Config 1 of 3Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline192722
2025Config 2 of 3Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline132116
2025Config 3 of 3Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline162218
2024Config 1 of 2Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline202722
2024Config 2 of 2Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142116
2023Config 1 of 3Auto 9-spd, 4 cyl, 2.0 L4 2.0LPremium Gasoline212723
2023Config 2 of 3Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142216
2023Config 3 of 3Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline132116
2022Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142116
2020Config 1 of 2Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202822
2020Config 2 of 2Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2019Config 1 of 3Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline152318
2019Config 2 of 3Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202823
2019Config 3 of 3Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2018Config 1 of 4Auto 7-spd, 12 cyl, 6.0 L12 6.0LPremium Gasoline132216
2018Config 2 of 4Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162519
2018Config 3 of 4Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202823
2018Config 4 of 4Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2017Config 1 of 4Auto 7-spd, 12 cyl, 6.0 L12 6.0LPremium Gasoline132216
2017Config 2 of 4Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162519
2017Config 3 of 4Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202823
2017Config 4 of 4Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline172520
2016Config 1 of 4Auto 7-spd, 12 cyl, 6.0 L12 6.0LPremium Gasoline142117
2016Config 2 of 4Auto 7-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202723
2016Config 3 of 4Auto 7-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline162419
2016Config 4 of 4Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162519
2015Config 1 of 4Auto 7-spd, 12 cyl, 6.0 L12 6.0LPremium Gasoline142117
2015Config 2 of 4Auto 7-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202723
2015Config 3 of 4Auto 7-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline182420
2015Config 4 of 4Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline162519

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 SL-Class data analysis

How Mercedes-Benz SL-Class combined fuel economy varies

Across 35 configurations recorded for the 2015 through 2027 Mercedes-Benz SL-Class, combined fuel economy runs from 16 MPG to 23 MPG. The strongest figure belongs to the 2015 Mercedes-Benz SL-Class (Auto 7-spd, 6 cyl, 3.0 L) at 23 MPG, and the weakest to the 2027 car (Auto 9-spd, 8 cyl, 4.0 L) at 16 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 SL-Class would be misleading.

What changed for 2027

Average combined fuel economy for the 2027 Mercedes-Benz SL-Class is 16 MPG, against 18 MPG for the 2026 car — it fell by 2 MPG. Buyers who care most about this figure should look at the earlier model years in the table above before assuming newest is best.

How to read this Mercedes-Benz SL-Class data

This page lists every 2015 through 2027 Mercedes-Benz SL-Class record we hold for this measurement — 35 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 SL-Class numbers

The 2015 through 2027 Mercedes-Benz SL-Class entries here cover variants including Auto 9-spd, 8 cyl, 4.0 L, Auto 9-spd, 4 cyl, 2.0 L, Auto 9-spd, 6 cyl, 3.0 L, Auto 9-spd, 8 cyl, 4.7 L, Auto 7-spd, 8 cyl, 5.5 L, Auto 7-spd, 12 cyl, 6.0 L, Auto 7-spd, 6 cyl, 3.0 L and Auto 7-spd, 8 cyl, 4.7 L. 2018 is the busiest model year in the record with 4 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 SL-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 SL-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 mph28 MPG28 MPG0%
65 mph28 MPG26.1 MPG7%
70 mph28 MPG24.3 MPG13%
75 mph28 MPG22.6 MPG19%
80 mph28 MPG21.1 MPG25%

Our Real-World Speed MPG Adjuster re-scales the Mercedes-Benz SL-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 SL-Class MPG

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

The Mercedes-Benz SL-Class gets up to 23 MPG combined (21 city / 27 highway) in the 2027 model year. Fuel economy varies by engine and trim — see the full table above for details.

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

The Auto 9-spd, 4 cyl, 2.0 L trim offers the best combined fuel economy at 23 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

View full Mercedes-Benz SL-Class specs

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