EPA-verified MPG for all 32 variants (2016–2026)
GLC300 by model year — click a row to jump to that year
| Year | Best MPG | Avg MPG | Variants |
|---|---|---|---|
| 2026 | 27 MPG | 26 MPG | 3 |
| 2025 | 27 MPG | 26 MPG | 3 |
| 2024 | 29 MPG | 27 MPG | 3 |
| 2023 | 28 MPG | 25 MPG | 3 |
| 2022 | 24 MPG | 24 MPG | 3 |
| 2021 | 25 MPG | 24 MPG | 3 |
| 2020 | 24 MPG | 24 MPG | 3 |
| 2019 | 24 MPG | 24 MPG | 3 |
| 2018 | 24 MPG | 24 MPG | 3 |
| 2017 | 24 MPG | 24 MPG | 3 |
| 2016 | 24 MPG | 24 MPG | 2 |