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Mercedes-Benz GLS-Class MPG & Fuel Economy

The 2026 Mercedes-Benz GLS-Class gets up to 21 MPG combined (19 city / 24 highway) in EPA testing.

Latest model year (2026):

The Mercedes-Benz GLS-Class gets up to 21 MPG combined (19 city / 24 highway) in the Auto 9-spd, 6 cyl, 3.0 L trim.

Verifiedfueleconomy.gov · Verified August 11, 2026
OverviewMPGEngine SpecsFuel CostTransmissionDrivetrainVehicle ClassMaintenance

Mercedes-Benz GLS-Class MPG — All Years

YearTrimEngineFuelCity (MPG)Hwy (MPG)Combined (MPG)
2026Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline192421
2026Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142016
2026Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline131815
2026Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline152017
2025Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline192421
2025Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141815
2025Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141916
2025Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline131815
2024Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline192421
2024Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142016
2024Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141816
2024Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141916
2023Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline182320
2023Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141916
2023Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline152017
2023Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline162118
2022Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline182420
2022Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141815
2022Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline162118
2022Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline142017
2021Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline202421
2021Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline162118
2021Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline141816
2021Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline151916
2020Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline192321
2020Auto 9-spd, 8 cyl, 4.0 L8 4.0LPremium Gasoline162118
2019Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline131815
2019Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline162218
2019Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline141916
2018Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline131815
2018Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline172219
2018Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline141916
2017Auto 7-spd, 8 cyl, 5.5 L8 5.5LPremium Gasoline131714
2017Auto 9-spd, 6 cyl, 3.0 L6 3.0LPremium Gasoline172219
2017Auto 9-spd, 8 cyl, 4.7 L8 4.7LPremium Gasoline141816

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 GLS-Class MPG FAQ

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

The Mercedes-Benz GLS-Class gets up to 21 MPG combined (19 city / 24 highway) in the 2026 model year. Fuel economy varies by engine and trim — see the full table above for details.

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

The Auto 9-spd, 6 cyl, 3.0 L trim offers the best combined fuel economy at 21 MPG. Smaller engines and front-wheel-drive configurations typically achieve the highest MPG.

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