27 MPG combined is an acceptable figure for the 2021 Mercedes-Benz C300 Coupe. This isn’t a vehicle aimed at hypermilers. It’s a stylish two-door intended to deliver a premium driving experience, and its fuel economy reflects that priority. Buyers are typically more concerned with aesthetics, technology, and brand cachet than outright fuel efficiency, understanding that some compromise is inherent in owning a luxurious coupe.

City and highway performance

The EPA estimates 24 MPG in the city and 33 MPG on the highway for the 2021 C300 Coupe. The city figure is decent, benefiting from the engine’s stop/start system that helps conserve fuel while idling at traffic lights. Frequent short trips and aggressive acceleration will naturally depress this number. The highway MPG is more impressive. The car’s aerodynamic design and the 9-speed automatic transmission allow the engine to cruise at lower RPMs. Drivers who prioritize long-distance journeys will find the C300 Coupe a relatively efficient option.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2021 Mercedes-Benz C300 Coupe is $2,150. This calculation is based on driving 15,000 miles per year and using the national average fuel price. This is just an estimate. Your actual fuel costs will depend on your driving habits, the type of fuel you use (premium is recommended for optimal performance), and current gas prices in your area. Drivers who drive significantly more than 15,000 miles annually should expect to exceed this figure. For more details, you can review all Mercedes Benz fuel economy data.

Real-world expectations

The EPA figures provide a useful benchmark, but real-world fuel economy often differs. Drivers who frequently drive fast or spend a lot of time in heavy traffic may see figures below the EPA estimates. Those who drive smoothly, use cruise control, and maintain consistent speeds on the highway may achieve results closer to or even slightly better than the official MPG ratings. Your driving style will have a significant impact on the C300 Coupe’s fuel consumption.

How it compares

Compared to its competitors, the 2021 C300 Coupe holds its own in terms of fuel economy. The BMW 430i Coupe, for example, achieves a similar combined MPG of 28, demonstrating comparable efficiency in its class. The Audi A5 Coupe, with its standard Quattro all-wheel drive, comes in slightly lower at 27 MPG combined. Stepping outside the German brands, the Infiniti Q60 offers a lower combined MPG in its base trim. The differences may seem marginal, and they can add up over time. Drivers concerned about less gas should consider that opting for features like all-wheel drive, as available on other C300 models, could negatively affect MPG. You can check C300 MPG across all years to see changes over time.

Tips to maximize efficiency

The 2.0-liter turbocharged engine in the C300 Coupe is responsive but also benefits from a gentle touch. Avoid aggressive acceleration and hard braking to conserve fuel. Smooth and steady driving will yield better results than trying to mimic a race car driver.

Take advantage of the C300 Coupe’s driving modes. The “Eco” mode optimizes various vehicle settings to prioritize fuel efficiency. It might slightly reduce responsiveness, and it can make a noticeable difference on longer journeys. Experiment with the different modes and find the one that best suits your driving conditions.

Proper tire inflation is critical for fuel economy. Check your tire pressure regularly and inflate them to the manufacturer’s recommended specifications, which can be found on a sticker inside the driver’s side doorjamb. Under-inflated tires create more rolling resistance, which increases fuel consumption.

Minimize unnecessary weight. Carrying around extra cargo in the trunk or backseat reduces fuel efficiency. Remove any items you don’t need to lighten the load and improve MPG. Every pound counts, especially in a car designed for performance.

Routine maintenance is essential for optimal fuel economy. Ensure your C300 Coupe receives regular oil changes, air filter replacements, and other scheduled maintenance services. A well-maintained engine runs more efficiently, saving you money at the pump.