The 2023 Mercedes-Benz C300 Coupe gets 25 MPG combined. This isn’t going to win any fuel efficiency awards, but it’s a respectable figure for a stylish, sporty coupe that prioritizes aesthetics. Buyers in this segment often value performance and appearance, and the C300 Coupe performs well in both areas. Its fuel consumption can be considered a calculated tradeoff. This isn’t a Prius competitor. It’s a luxury coupe, and its efficiency reflects that.

City and highway performance

The EPA estimates the C300 Coupe at 22 MPG in the city and 31 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the 2.0L turbocharged four-cylinder engine is constantly working through its nine-speed automatic transmission. The highway number, however, shows the engine’s efficiency at consistent speeds. Long road trips will squeeze more miles out of each gallon compared to daily commutes, allowing owners to enjoy the spirited performance without emptying their wallets frequently. The smooth-shifting nine-speed also aids in highway efficiency, keeping the engine in its optimal RPM range.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2023 Mercedes-Benz C300 Coupe at exactly $2,300. This is based on driving 15,000 miles per year, using national average fuel prices. Keep in mind that premium fuel is recommended at a minimum. Fuel prices fluctuate, meaning your individual cost could be higher or lower depending on your driving habits and location. Still, the $2,300 figure provides a solid benchmark for budgeting fuel expenses over a year.

Real-world expectations

While the EPA provides a standardized testing benchmark, real-world fuel economy always varies. Aggressive driving, frequent short trips, and even weather conditions can affect your mileage. Owners who frequently use the C300 Coupe’s Sport or Sport+ driving modes will likely see a dip in fuel efficiency in favor of quicker throttle response and more aggressive shift patterns. However, consistent use of Eco mode can help you get closer to or even slightly above the EPA estimates. Regularly check your C300’s trip computer to monitor your average fuel consumption and adjust driving habits accordingly.

How it compares

The C300 Coupe exists in a competitive vehicle category. Its fuel economy compares differently against various rivals. The BMW 430i Coupe, for example, achieves 28 MPG combined, offering slightly better efficiency. A comparable Audi A5 Coupe delivers 27 MPG combined. These differences, while relevant, are often less important to buyers in this segment than factors such as styling, brand cachet, and driving dynamics. Those seeking the most efficient luxury coupe might look toward alternatives like a Lexus RC 300, which offers similar MPG with exceptional reliability. But even looking at C300 MPG across all years, it’s clear that this model isn’t typically cross-shopped with ultra-efficient vehicles. This is a luxury coupe.

Tips to maximize efficiency

Use the C300 Coupe’s driving modes. Eco mode optimizes the engine and transmission for maximum fuel efficiency. While it may slightly reduce throttle response, Eco mode is an excellent choice for daily commutes and highway cruising when you want to save gas, not increase driving performance. Frequent use of Sport or Sport+ mode dramatically increases fuel consumption.

Proper tire inflation plays an important role in fuel economy. Check your tire pressure regularly, as indicated on the door jamb sticker. Underinflated tires increase rolling resistance, forcing the engine to work harder, decreasing fuel efficiency. Properly inflated tires also improve handling and tire wear.

Minimize idling time. Modern engines are designed to be efficient at idle, but extended idling still consumes fuel needlessly. If you’re stopped for more than a minute, consider turning off the engine, especially in congested urban environments. This can make a noticeable difference in your overall fuel consumption, particularly during city driving.

Avoid aggressive driving habits. Rapid acceleration and hard braking are major fuel economy killers. The C300 invites a spirited driving style, but try to maintain a smooth and consistent pace, allowing the engine to operate more efficiently. Gentle acceleration and coasting to a stop extend mileage. Owners can consult all Mercedes Benz fuel economy data for driving tips across their vehicle lineup.