The 2020 Mercedes-Benz C300 4matic Coupe, equipped with its 2.0L 4-cylinder, achieves a combined EPA-estimated fuel economy of 25 MPG. This isn’t intended for hypermilers. Instead, it reflects the balance Mercedes-Benz expects its C300 Coupe buyers to accept: stylish two-door looks and brisk performance balanced against reasonable, but not class-leading, fuel consumption.

City and highway performance

Broken down, the C300 Coupe’s fuel economy results in 21 MPG in the city and 30 MPG on the highway. The city figure reflects stop-and-go driving, showcasing the engine’s efficiency in dealing with frequent acceleration and deceleration. The 30 MPG highway estimate is more appealing for those who frequently take longer trips, demonstrating the engine’s ability to maintain efficiency at consistent speeds. The nine-speed automatic transmission plays a key role in both figures, optimizing engine speed for fuel economy regardless of driving conditions. But remember, these are EPA estimates, achieved under controlled conditions. Aggressive driving, particularly in Sport or Sport+ modes, will certainly lower fuel economy.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Mercedes-Benz C300 4matic Coupe at $2,300. This calculation is based on driving 15,000 miles per year and using national average fuel prices. It’s a helpful figure for comparison, but keep in mind that your actual costs may vary significantly depending on your location, driving habits, and the actual price of premium fuel, which is recommended for optimal performance of the C300’s turbocharged engine.

Real-world expectations

While the EPA provides standardized figures, real-world fuel economy often differs. C300 Coupe owners who prioritize performance and regularly use the car’s power will likely see figures closer to the city estimate, even on mixed driving routes. Drivers with a lighter foot and a greater focus on efficiency can realistically approach or even slightly exceed the highway MPG figure on long journeys. The 4matic all-wheel-drive system also has slight impact compared to the RWD model, even though the EPA fuel economy ratings are identical. The key is understanding that the 2.0L turbo engine responds directly to throttle input, so aggressive acceleration or consistent high speeds will drastically reduce fuel efficiency.

How it compares

In the competitive compact luxury coupe segment, the C300’s fuel economy is in the middle. The BMW 430i Coupe with rear-wheel drive achieves an EPA-estimated 28 MPG combined, offering a slight edge in efficiency. The Audi A5 Coupe, with its similar 2.0T engine and quattro all-wheel drive, mirrors the C300’s 25 MPG combined. Fuel economy is not the primary purchase driver for buyers shopping in this class; however, the perception of overall cost is a consideration. While the C300 Coupe prioritizes luxury, technology, and style over outright fuel savings, it still offers a reasonable balance relative to its competitors. Buyers focused on fuel savings, however, will find all Mercedes Benz fuel economy data pointing to models such as the A220 as more attractive.

Tips to maximize efficiency

Use the C300’s driving modes. Comfort mode offers the smoothest throttle response and the most fuel-efficient shift points. Sport and Sport+ modes are tuned for performance and will drastically reduce fuel economy.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly for the optimum MPG.

Minimize idling. Modern engines are remarkably efficient when running, but idling burns fuel without moving the car. If you anticipate being stationary for more than a minute, turn off the engine.

Be mindful of cargo weight. The heavier the vehicle, the more fuel required to accelerate and maintain speed. Remove any unnecessary items from the trunk to reduce weight and improve fuel efficiency. Frequent heavy loads will hurt the C300 MPG across all years.

Drive smoothly and anticipate traffic flow. Avoid sudden acceleration and braking, which waste fuel. Maintain a consistent speed and stay aware of upcoming traffic conditions to minimize unnecessary speed changes.