# Mercedes-Benz GLS-Class specs and mpg by year - **Latest year:** 2027 - **MPG (combined):** 21 - **Drive:** AWD - **Years covered:** 2017-2027 ## Quick answer The 2027 Mercedes-Benz GLS-Class is a midsize/large SUV rated at 21 mpg combined. Engines: 3.0L V6 turbo hybrid. ## Every 2027 Mercedes-Benz GLS-Class version | Version | Engine | Drive | Transmission | City/Hwy | Combined | Fuel cost / year | CO2 | | --- | --- | --- | --- | --- | --- | --- | --- | | GLS450 4matic | 3.0L V6 turbo hybrid | AWD | Automatic | 19/24 | 21 mpg | $3,900 | 424 g/mi | Each row is a version the EPA tested. Fuel cost assumes 15,000 miles a year (55% city) at national average prices; CO2 is tailpipe emissions. ## Mercedes-Benz GLS-Class specs by year | Year | Engines | Transmission | Drive | MPG (combined) | | --- | --- | --- | --- | --- | | 2027 | 3.0L V6 turbo hybrid | Automatic | AWD | 21 | | 2026 | 4.0L V8 turbo hybrid; 3.0L V6 turbo hybrid | Automatic | AWD | 15-21 | | 2025 | 4.0L V8 turbo hybrid; 3.0L V6 turbo hybrid | Automatic | AWD | 15-21 | | 2024 | 4.0L V8 turbo hybrid; 3.0L V6 turbo hybrid | Automatic | AWD | 16-21 | | 2023 | 3.0L V6 turbo hybrid; 4.0L V8 turbo hybrid | Automatic | AWD | 16-20 | | 2022 | 3.0L V6 turbo hybrid; 4.0L V8 turbo hybrid | Automatic | 4WD, AWD | 15-20 | | 2021 | 4.0L V8 turbo hybrid; 3.0L V6 turbo hybrid | Automatic | 4WD | 16-21 | | 2020 | 3.0L V6 turbo hybrid; 4.0L V8 turbo hybrid | Automatic | 4WD | 18-21 | | 2019 | 3.0L V6 turbo; 4.7L V8 turbo; 5.5L V8 turbo | Automatic | 4WD | 15-18 | | 2018 | 3.0L V6 turbo; 4.7L V8 turbo; 5.5L V8 turbo | Automatic | 4WD | 15-19 | | 2017 | 3.0L V6 turbo; 5.5L V8 turbo; 4.7L V8 turbo | Automatic | 4WD | 14-19 | EPA combined ratings. MPGe is the EPA efficiency measure for electric cars. Ranges cover every engine and drivetrain EPA tested for that year. ## How has the GLS-Class changed over the years? - **2027:** dropped 4.0L V8 turbo hybrid. - **2025:** combined mpg went from 16-21 to 15-21. - **2024:** combined mpg went from 16-20 to 16-21. - **2023:** 4WD was dropped; combined mpg went from 15-20 to 16-20. - **2022:** AWD became available; combined mpg went from 16-21 to 15-20. - **2021:** combined mpg went from 18-21 to 16-21. - **2020:** added 3.0L V6 turbo hybrid and 4.0L V8 turbo hybrid; dropped 3.0L V6 turbo, 4.7L V8 turbo and 5.5L V8 turbo. - **2019:** combined mpg went from 15-19 to 15-18. - **2018:** combined mpg went from 14-19 to 15-19. ## What does it cost to run a GLS-Class? The EPA puts the 2027 Mercedes-Benz GLS-Class's fuel cost at **$3,900 a year**, against about $2,970 for other current midsize/large SUVs: roughly 31% more. Over five years at 15,000 miles a year that is about $19,500 in fuel. ## GLS-Class vs rivals | Model | Powertrains | Fuel economy | Fuel cost / year | | --- | --- | --- | --- | | [Jeep Cherokee](/vehicles/jeep-cherokee) | Hybrid | 37 mpg | $1,800 | | [Toyota Grand Highlander](/vehicles/toyota-grand-highlander) | Gas, Hybrid | 22-36 mpg | $1,850-$3,050 | | [Toyota Highlander](/vehicles/toyota-highlander) | Gas, Hybrid | 24-35 mpg | $1,900-$2,800 | | [Kia Telluride](/vehicles/kia-telluride) | Gas, Hybrid | 19-35 mpg | $1,900-$3,550 | | [Hyundai Palisade](/vehicles/hyundai-palisade) | Gas, Hybrid | 19-34 mpg | $1,950-$3,550 | | [Volvo XC90](/vehicles/volvo-xc90) | Hybrid, Plug-in hybrid | 23-27 mpg | $3,050-$3,550 | | [Lexus TX](/vehicles/lexus-tx) | Gas, Hybrid | 23-27 mpg | $3,050-$3,550 | | [BMW X5](/vehicles/bmw-x5) | Hybrid, Plug-in hybrid | 15-26 mpg | $3,150-$5,500 | Other current midsize/large SUVs from other makes, most efficient first. ## Frequently asked questions ### What mpg does the 2027 Mercedes-Benz GLS-Class get? The 2027 Mercedes-Benz GLS-Class is EPA-rated at 21 mpg combined, depending on engine and drivetrain. Real-world mileage varies with speed, climate and load. ### What engine does the 2027 Mercedes-Benz GLS-Class have? The 2027 Mercedes-Benz GLS-Class comes with: 3.0L V6 turbo hybrid. It uses automatic transmission and is offered with AWD. ### Is there a hybrid Mercedes-Benz GLS-Class? Yes. The Mercedes-Benz GLS-Class has been offered as a hybrid in some model years; the table above shows which. ### Which Mercedes-Benz GLS-Class year gets the best gas mileage? In the EPA data, the 2027 Mercedes-Benz GLS-Class has the highest combined rating, up to 21 mpg. Ratings for the same model can change between years when engines or test procedures change. ### How much does it cost to fuel a 2027 Mercedes-Benz GLS-Class for a year? About $3,900 a year, using the EPA's assumptions of 15,000 miles (55% city, 45% highway) at national average fuel prices. Your cost depends on your local prices, mileage and driving style. ### What is the city and highway mpg of the 2027 Mercedes-Benz GLS-Class? The most efficient 2027 version, the GLS450 4matic, is rated 19 mpg city and 24 mpg highway (21 combined). Other engines and drivetrains are rated lower; the versions table above lists each one. ### How much CO2 does the 2027 Mercedes-Benz GLS-Class emit? EPA rates its tailpipe CO2 at 424 grams per mile depending on version. Lower is better; the cleanest gas cars sit under 250 g/mi and electric cars have none at the tailpipe. ### Does the 2027 Mercedes-Benz GLS-Class come with all-wheel drive? Yes. The 2027 Mercedes-Benz GLS-Class is offered with AWD. All- or four-wheel drive usually costs 1-3 mpg compared with the two-wheel-drive version of the same engine, as the versions table shows. ### Is the Mercedes-Benz GLS-Class cheap to run compared with other midsize/large SUVs? No, dearer than average: its EPA annual fuel cost of $3,900 compares with about $2,970 for other current midsize/large SUV models. Fuel is only part of running costs; insurance, tires and repairs also differ. ## Sources - [fueleconomy.gov (US DOE and EPA)](https://www.fueleconomy.gov/) ## All Mercedes-Benz SUVs - [Mercedes-Benz GLB-Class](https://diagxcar.com/vehicles/mercedes-benz-glb-class) - [Mercedes-Benz GLC-Class](https://diagxcar.com/vehicles/mercedes-benz-glc-class) - [Mercedes-Benz G-Class](https://diagxcar.com/vehicles/mercedes-benz-g-class) - [Mercedes-Benz GLE-Class](https://diagxcar.com/vehicles/mercedes-benz-gle-class) ## More Mercedes-Benz models - [Mercedes-Benz AMG GT](https://diagxcar.com/vehicles/mercedes-benz-amg-gt) - [Mercedes-Benz C-Class](https://diagxcar.com/vehicles/mercedes-benz-c-class) - [Mercedes-Benz CLA-Class](https://diagxcar.com/vehicles/mercedes-benz-cla-class) - [Mercedes-Benz CLE-Class](https://diagxcar.com/vehicles/mercedes-benz-cle-class) - [Mercedes-Benz E-Class](https://diagxcar.com/vehicles/mercedes-benz-e-class) - [Mercedes-Benz EQE](https://diagxcar.com/vehicles/mercedes-benz-eqe) - [Mercedes-Benz EQS](https://diagxcar.com/vehicles/mercedes-benz-eqs) - [Mercedes-Benz GLA-Class](https://diagxcar.com/vehicles/mercedes-benz-gla-class) - [Mercedes-Benz S-Class](https://diagxcar.com/vehicles/mercedes-benz-s-class) - [Mercedes-Benz SL-Class](https://diagxcar.com/vehicles/mercedes-benz-sl-class) - [Mercedes-Benz A-Class](https://diagxcar.com/vehicles/mercedes-benz-a-class): discontinued ## Other midsize/large SUVs - [Nissan Armada](https://diagxcar.com/vehicles/nissan-armada) - [Nissan Pathfinder](https://diagxcar.com/vehicles/nissan-pathfinder) - [Porsche Cayenne](https://diagxcar.com/vehicles/porsche-cayenne) - [Rivian R1S](https://diagxcar.com/vehicles/rivian-r1s) - [Subaru Ascent](https://diagxcar.com/vehicles/subaru-ascent) - [Tesla Model X](https://diagxcar.com/vehicles/tesla-model-x) - [Toyota 4Runner](https://diagxcar.com/vehicles/toyota-4runner) - [Toyota Grand Highlander](https://diagxcar.com/vehicles/toyota-grand-highlander) ## Car care - [How long do tires last?](https://diagxcar.com/how-long/tires) - [How often to change oil](https://diagxcar.com/how-often/change-oil) - [Tire size calculator](https://diagxcar.com/tools/tire-size-calculator) --- Source page: https://diagxcar.com/vehicles/mercedes-benz-gls-class Updated: 2026-11-03 General information, not a substitute for a qualified mechanic.