2020 Mercedes-Benz GLC300 MPG and Fuel Economy

On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 2020 Mercedes-Benz GLC300.

The 2020 Mercedes-Benz GLC300 runs on premium gasoline and is in the Small Sport Utility Vehicle 2WD car class.

Whether you are considering a purchase of the car, or just wanting to find out how economical and environmentally friendly (or un-friendly) your 2020 Mercedes-Benz GLC300 is, we have the information you need.

🛣 How Many Miles per Gallon (MPG) Does a 2020 Mercedes-Benz GLC300 Get?

First off, the most commonly asked question. A 2020 Mercedes-Benz GLC300 gets up to 22 miles per gallon in the city, and 29 miles per gallon on the highway.

The combined average MPG for the 2020 Mercedes-Benz GLC300 is 24 miles per gallon.

💵 What is the Average Yearly Fuel Cost for a 2020 Mercedes-Benz GLC300?

The estimated fuel costs for the 2020 Mercedes-Benz GLC300 is $3,100 per year.

That value has been estimated by government regulators based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving.

If you were to compare a 2020 Mercedes-Benz GLC300 to an average vehicle over 5 years, you will spend $4,000 more on fuel.

🛢 How Many Barrels of Petroleum Does a 2020 Mercedes-Benz GLC300 Consume?

The 2020 Mercedes-Benz GLC300 will consume roughly 12 barrels of petroleum per year, using the standard estimate of 15,000 miles per year.

The majority of the world's petroleum is sourced from countries like Saudi Arabia, Russia, Iraq, and the United States.

💨 How Many Grams of CO2 Does a 2020 Mercedes-Benz GLC300 Emit?

For every mile driven, the 2020 Mercedes-Benz GLC300 will emit 366 grams of CO2, which is about 5,490,000 grams of CO2 per year.

🌳 To help you understand the impact of this, a normal tree will absorb around 21,000 grams of CO2 per year. This means that roughly 187 trees would be needed to offset emissions from the 2020 Mercedes-Benz GLC300.

Overview

The table below covers all of the miles per gallon, engine specifications, and emission details we have for the 2020 Mercedes-Benz GLC300.

City MPG22
Highway MPG29
Combined MPG24
Save/Spend vs Average CarSpend $4,000
Fuel Cost$3,100
Fuel Type 1Premium
Barrels of Petroleum12
Grams of CO25,490,000
Trees Needed to Offset261
DriveRear-Wheel Drive
Cylinders4
Displacement2
TransmissionAutomatic 9-spd
Vehicle ClassSmall Sport Utility Vehicle 2WD
Start/Stop?Yes
Supercharged?No
Turbocharged?Yes

Related Mercedes-Benz Models from 2020

If you're interested in other Mercedes-Benz models from 2020, you can find them in the table below. You can click the model link to find miles per gallon and emission information for that model.

Link To or Reference This Page

If you use this page in your research, please reference MPG Buddy as the source.

  • "2020 Mercedes-Benz GLC300 MPG and Fuel Economy." MPG Buddy. Accessed on January 3, 2026. https://mpgbuddy.com/cars/mercedes-benz/glc300/2020.

  • "2020 Mercedes-Benz GLC300 MPG and Fuel Economy." MPG Buddy, https://mpgbuddy.com/cars/mercedes-benz/glc300/2020. Accessed January 3, 2026.

  • 2020 Mercedes-Benz GLC300 MPG and Fuel Economy. MPG Buddy. Retrieved from https://mpgbuddy.com/cars/mercedes-benz/glc300/2020.