The 2020 Mercedes-Benz GLC300 4matic Coupe, with its sloping roofline and sporty design, achieves a combined fuel economy of 24 MPG. This isn’t the most efficient, but it isn’t a gas guzzler either. It is a reflection of the trade-off inherent in choosing a vehicle that prioritizes style and driving experience over saving gas. The GLC300 Coupe appeals to buyers who want the benefits of an SUV, all-wheel drive and an elevated seating position, but with a more athletic stance and a bit of exclusivity. For them, the 24 MPG is an acceptable trade-off.

City and highway performance

The EPA estimates the GLC300 Coupe at 21 MPG in the city and 28 MPG on the highway. The city figure reflects the stop-and-go of urban driving, where the 2.0L turbocharged four-cylinder engine works harder. The 9-speed automatic transmission, generally smooth and responsive, can contribute to lower city MPG if driven aggressively. On the open road, the GLC300 Coupe finds a more efficient rhythm, allowing the transmission to use its higher gears and keep the engine efficiently. This results in better fuel economy, making highway cruising more economical.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2020 Mercedes-Benz GLC300 4matic Coupe is $2,400. This calculation is based on driving 15,000 miles per year, with a mix of city and highway driving, using national average fuel prices. This is just an estimate, and your actual fuel costs may vary depending on your driving habits, the fuel you use, and local gas prices. But the $2,400 figure provides a benchmark to compare with other vehicles and understand the potential cost of ownership.

Real-world expectations

The EPA provides a standardized test cycle, but real-world fuel economy often differs from the official figures. Driving style, traffic, weather, and even tire pressure can influence the actual MPG. Owners who drive fast, particularly in Sport mode, will likely see lower fuel economy than those who drive smoothly and at consistent speeds. Cold weather can also hurt fuel efficiency because the engine takes longer to warm up. Expect that aggressive driving could easily drop the combined average closer to 20 MPG, while careful driving on long highway trips might approach or even briefly exceed 30 MPG.

How it compares

The 2020 GLC300 Coupe’s fuel economy is average compared to similar cars. The BMW X4 xDrive30i, with its 2.0L turbo-four, achieves a similar 24 MPG combined. The Audi Q5 Sportback 45 TFSI also mirrors this figure. The Acura RDX, not available in a coupe body style, achieves 23 MPG combined. The difference, while small, can add up. These figures provide a data point for buyers, but the driving experience and individual priorities weigh just as heavily. Someone who likes a sportier driving experience might accept the GLC300 Coupe’s fuel economy, while another buyer focused on efficiency might prefer a hybrid, even if that means sacrificing the coupe shape. Be sure to check GLC300 MPG across all years for trending insights into fuel performance. Also check out all Mercedes Benz fuel economy data.

Tips to maximize efficiency

Be mindful of how you accelerate. The GLC300 Coupe’s turbo engine responds quickly to the gas pedal, but fast acceleration uses more fuel. Smooth and gradual acceleration, especially from a stop, allows the engine to work better. Anticipate traffic and avoid unnecessary speed changes, which can quickly lower your MPG.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, making the engine work harder and burn more fuel. Check your tire pressure often, preferably when the tires are cold, and inflate them to the pressure listed on the sticker inside the driver’s side doorjamb. A simple tire pressure gauge can help over time.

Use the ECO drive mode. The GLC300 Coupe has different driving modes that change how the throttle responds, when the transmission shifts, and other settings. Selecting ECO mode prioritizes fuel efficiency by smoothing out throttle inputs and encouraging earlier upshifts. While it may slightly reduce the sporty feel, it can improve MPG, especially in city driving.

Avoid idling. Idling uses fuel without going anywhere. If you’re stopped for more than a minute, like at a long traffic light, turn off the engine. Modern engines restart quickly, reducing fuel use.

Reduce aerodynamic drag. The Coupe design is already aerodynamic, but removing items from the roof or cargo area can help. Roof racks, bike carriers, and cargo can increase wind resistance, making the engine work harder to maintain speed. Storing these items when not in use can help improve fuel economy, especially on the highway.