Mercedes-Benz GLC300 MPG by year — every rating on record

The Mercedes-Benz GLC300 has a combined EPA fuel economy rating for 12 model years, from 2016 to 2027. Across those years its best rated version returned 29 mpg (2024) and its thirstiest returned 24 mpg (2016). The EPA record holds 12 configurations for this nameplate, most recently a Small Sport Utility Vehicle 2WD.

Year-by-year EPA ratings

Where it has stood in its class

Ranked against every other nameplate the EPA filed under the same class that year. The Mercedes-Benz GLC300 placed highest in 2027 at #20 of 26, and lowest in 2025 at #61 of 82. It spent 1 of its 12 ranked years in the top half of its class.

Every configuration on record

All 12 configurations EPA lists for this nameplate, newest first.

How the rating has moved between model years

Comparing the best-rated configuration of each year. 3 of 5 year-over-year steps improved the top rating.

What GLC300 fuel costs over a year

At the EPA's 11,500 miles a year, the 2027 Mercedes-Benz GLC300 burns 426 to 426 gallons depending on configuration. Below is what that costs at three pump prices, and how much more the thirstiest configuration costs than the most efficient one.

EPA’s own estimate for the 2027 model year is $2,850 to $2,850 a year in fuel, or $3,000 more than the average new vehicle over five years.

How it compares with other Small Sport Utility Vehicle 2WD

Across the 152 nameplates EPA classifies as Small Sport Utility Vehicle 2WD, the median best combined rating is 29 mpg. At 27 mpg the Mercedes-Benz GLC300 is 2 mpg below the median, which is worth about $103 a year at $3.50 a gallon.

• All Small Sport Utility Vehicle 2WD rankings — every nameplate in the class, best to worst.

Other Mercedes-Benz nameplates

Every Mercedes-Benz model compared → — all nameplates ranked by best combined rating, with what each one costs a year.