Mercedes-Benz GLC300: MPG and fuel economy by year
The EPA has rated the Mercedes-Benz GLC300 across 11 model years, from the 2016 Mercedes-Benz GLC300 through the 2026 Mercedes-Benz GLC300. The most recent 2026 Mercedes-Benz GLC300 returns 27 combined MPG. The most efficient model year was the 2024 Mercedes-Benz GLC300 at 29 MPG.
Pick a year below to open the full Mercedes-Benz GLC300 page for that model year. Each year page covers combined, city, and highway MPG, the trim variants the EPA rates separately, the annual fuel cost across three driving patterns, and a year-over-year comparison so you can see whether the car has improved.
Fuel economy by model year
Combined MPG, city MPG, highway MPG, and the EPA's estimated annual fuel cost for every model year of the Mercedes-Benz GLC300. Click any year to see the full breakdown for that model year, including trim variants, the drivetrain, and a comparison against other vehicles in its segment.
| Year | Model | Combined MPG | City | Highway | Annual fuel cost |
|---|---|---|---|---|---|
| 2026 | 2026 Mercedes-Benz GLC300 | 27 MPG | 24 MPG | 32 MPG | $2,550 |
| 2025 | 2025 Mercedes-Benz GLC300 | 27 MPG | 24 MPG | 32 MPG | $2,550 |
| 2024 | 2024 Mercedes-Benz GLC300 | 29 MPG | 26 MPG | 33 MPG | $2,400 |
| 2023 | 2023 Mercedes-Benz GLC300 | 28 MPG | 25 MPG | 32 MPG | $2,450 |
| 2022 | 2022 Mercedes-Benz GLC300 | 24 MPG | 22 MPG | 27 MPG | $2,900 |
| 2021 | 2021 Mercedes-Benz GLC300 | 25 MPG | 22 MPG | 29 MPG | $2,750 |
| 2020 | 2020 Mercedes-Benz GLC300 | 24 MPG | 22 MPG | 29 MPG | $2,900 |
| 2019 | 2019 Mercedes-Benz GLC300 | 24 MPG | 22 MPG | 27 MPG | $2,900 |
| 2018 | 2018 Mercedes-Benz GLC300 | 24 MPG | 22 MPG | 28 MPG | $2,900 |
| 2017 | 2017 Mercedes-Benz GLC300 | 24 MPG | 22 MPG | 28 MPG | $2,900 |
| 2016 | 2016 Mercedes-Benz GLC300 | 24 MPG | 22 MPG | 28 MPG | $2,900 |
How the Mercedes-Benz GLC300 compares against the Small Sport Utility Vehicle 2WD class
Buyers usually compare the Mercedes-Benz GLC300 against other cars in the same EPA class. The list below shows the most efficient cars in the Small Sport Utility Vehicle 2WD class for the 2026 model year, the latest year on this page. Each link opens the full page for that car.
Source: U.S. EPA fuel economy dataset. Annual fuel cost assumes 15,000 miles of driving per year and a 55% city, 45% highway split.