Mercedes-Benz GLC300
27 MPG The 2026 Mercedes-Benz GLC300 is EPA-rated at 27 MPG combined (24 city / 32 highway). Over 15,000 miles a year that is about 556 gallons, $1778 a year in fuel, or $0.119 per mile at $3.20/gal.
Across its full 2016–2026 run it averages 25.5 MPG, improving by 3 MPG over 11 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.093 | $926 | $1389 | $1852 |
| $3.00/gal | $0.111 | $1111 | $1667 | $2222 |
| $3.20/gal | $0.119 | $1185 | $1778 | $2370 |
| $3.50/gal | $0.130 | $1296 | $1944 | $2593 |
| $4.00/gal | $0.148 | $1481 | $2222 | $2963 |
| $4.50/gal | $0.167 | $1667 | $2500 | $3333 |
| $5.00/gal | $0.185 | $1852 | $2778 | $3704 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2026 | 27 MPG | 24 | 32 | $2850 | 323 | 1 |
| 2025 | 27 MPG | 24 | 32 | $2850 | 323 | 1 |
| 2024 | 29 MPG | 26 | 33 | $2650 | 311 | 1 |
| 2023 | 28 MPG | 25 | 32 | $2750 | 316 | 1 |
| 2022 | 24 MPG | 22 | 27 | $3200 | 373 | 1 |
| 2021 | 25 MPG | 22 | 29 | $3100 | 360 | 1 |
| 2020 | 24 MPG | 22 | 29 | $3200 | 366 | 1 |
| 2019 | 24 MPG | 22 | 27 | $3200 | 370 | 1 |
| 2018 | 24 MPG | 22 | 28 | $3200 | 364 | 1 |
| 2017 | 24 MPG | 22 | 28 | $3200 | 364 | 1 |
| 2016 | 24 MPG | 22 | 28 | $3200 | 366 | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 74 small sport utility vehicle 2wd models tracked here, the Mercedes-Benz GLC300 ranks 33 on current figures, against a class average of 34.7 MPG.
Closest more-efficient alternatives in the same class: Buick Encore (27.5), Hyundai Tucson FWD (28), Kia Sportage FWD (28), Mitsubishi Outlander 2WD (28), Volkswagen Tiguan (28).
Tailpipe CO₂ is rated at 323 grams per mile, which works out to roughly 4.8 tonnes a year at 15,000 miles.
Questions
What MPG does the Mercedes-Benz GLC300 get?
The 2026 Mercedes-Benz GLC300 is rated at 27 MPG combined by the EPA — 24 city and 32 highway. Across all 11 model years in the database it averages 25.5 MPG, ranging from 24 to 29 depending on year and trim.
How much does a Mercedes-Benz GLC300 cost in fuel per year?
At 27 MPG and 15,000 miles a year, it burns about 556 gallons — roughly $1778 a year with fuel at $3.20 a gallon, or $0.119 per mile. The EPA's own published annual figure for the 2026 model is $2850.
Has the Mercedes-Benz GLC300 become more efficient over time?
Yes. It has gone from 24 MPG in 2016 to 27 in 2026 — an improvement of 3 MPG, or 13% across 11 model years.
Is the Mercedes-Benz GLC300 efficient for its class?
It ranks 33 of 74 in the Small Sport Utility Vehicle 2WD class on current figures, against a class average of 34.7 MPG. That is 7.7 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.