Mercedes-Benz SLC-Class Fuel Economy (MPG)

Name: Mercedes-Benz SLC-Class MPG & Fuel Economy
Creator: AutoSpecData
License: https://creativecommons.org/licenses/by/4.0/

What is the real-world gas mileage of a 2020 Mercedes-Benz SLC-Class?

The 2020 Mercedes-Benz SLC-Class gets up to 27 MPG combined (23 city / 32 highway) in EPA testing.

Latest model year (2020):

The Mercedes-Benz SLC-Class gets up to 27 MPG combined (23 city / 32 highway) in the Auto 9-spd, 4 cyl, 2.0 L trim.

Verifiedfueleconomy.gov · Verified August 9, 2026

Overview MPG Engine Specs Fuel Cost Transmission Drivetrain Vehicle Class Maintenance Dimensions Curb Weight

Mercedes-Benz SLC-Class MPG — All Years

Year	Trim	Engine	Fuel	City (MPG)	Hwy (MPG)	Combined (MPG)
2020Config 1 of 2	Auto 9-spd, 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	23	32	27
2020Config 2 of 2	Auto 9-spd, 6 cyl, 3.0 L	6 3.0L	Premium Gasoline	20	29	23
2019Config 1 of 2	Auto 9-spd, 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	23	32	27
2019Config 2 of 2	Auto 9-spd, 6 cyl, 3.0 L	6 3.0L	Premium Gasoline	20	29	23
2018Config 1 of 2	Auto 9-spd, 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	25	32	27
2018Config 2 of 2	Auto 9-spd, 6 cyl, 3.0 L	6 3.0L	Premium Gasoline	20	29	23
2017Config 1 of 2	Auto 9-spd, 4 cyl, 2.0 L	4 2.0L	Premium Gasoline	25	32	27
2017Config 2 of 2	Auto 9-spd, 6 cyl, 3.0 L	6 3.0L	Premium Gasoline	20	29	23

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 SLC-Class data analysis

How Mercedes-Benz SLC-Class combined fuel economy varies

Across 8 configurations recorded for the 2017 through 2020 Mercedes-Benz SLC-Class, combined fuel economy runs from 23 MPG to 27 MPG. The strongest figure belongs to the 2017 Mercedes-Benz SLC-Class (Auto 9-spd, 4 cyl, 2.0 L) at 27 MPG, and the weakest to the 2020 car (Auto 9-spd, 6 cyl, 3.0 L) at 23 MPG — a spread of 17%. The narrow spread means any year of the Mercedes-Benz SLC-Class in this table behaves much like the others, so you can shop on price, condition and mileage rather than chasing a particular model year.

What changed for 2020

Average combined fuel economy for the 2020 Mercedes-Benz SLC-Class is 25 MPG, against 25 MPG for the 2019 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 SLC-Class data

This page lists every 2017 through 2020 Mercedes-Benz SLC-Class record we hold for this measurement — 8 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 SLC-Class numbers

The 2017 through 2020 Mercedes-Benz SLC-Class entries here cover the variants Auto 9-spd, 4 cyl, 2.0 L and Auto 9-spd, 6 cyl, 3.0 L. 2020 is the busiest model year in the record with 2 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 SLC-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 SLC-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 speed	EPA highway spec	AutoSpecData adjusted MPG	Fuel you lose
60 mph	32 MPG	32 MPG	0%
65 mph	32 MPG	29.8 MPG	7%
70 mph	32 MPG	27.8 MPG	13%
75 mph	32 MPG	25.9 MPG	19%
80 mph	32 MPG	24.1 MPG	25%

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

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

The Mercedes-Benz SLC-Class gets up to 27 MPG combined (23 city / 32 highway) in the 2020 model year. Fuel economy varies by engine and trim — see the full table above for details.

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

The Auto 9-spd, 4 cyl, 2.0 L trim offers the best combined fuel economy at 27 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.