24 MPG combined isn’t going to win any efficiency awards, but that’s not the point of the 2022 Mercedes-Benz C300 4matic Convertible. This car exists for top-down cruising, a stylish statement, and the effortless enjoyment of a finely crafted automobile. Buyers considering a luxury convertible with all-wheel drive aren’t prioritizing maximum fuel economy; they’re seeking a great driving experience and open-air thrills.

City and highway performance

The EPA estimates the C300 Convertible at 21 MPG in the city and 30 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the 2.0L turbocharged engine works harder to get the car moving from a standstill. On the open road, at consistent speeds, the nine-speed automatic transmission helps the C300 achieve its higher highway rating. The 30 MPG highway figure is respectable for a car of this type, suggesting that longer road trips won’t be excessively costly in terms of fuel.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2022 Mercedes-Benz C300 4matic Convertible at $2,400. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel prices when the EPA testing was conducted. Fluctuations in gasoline prices can significantly impact this figure.

If you drive more or less than 15,000 miles annually, your actual fuel costs will vary accordingly. Premium fuel is recommended though not required, which will affect the amount spent.

Real-world expectations

While the EPA provides a standardized testing process, real-world fuel economy often differs. Factors such as driving style, traffic conditions, weather, and even tire pressure can influence the MPG you experience. Aggressive acceleration and frequent hard braking will decrease fuel economy, while a smooth and consistent driving style will help you achieve closer to the EPA estimates.

Many people enjoying the C300’s performance and responsiveness might see figures slightly below the official ratings, while more conservative drivers could potentially exceed them.

How it compares

In the realm of luxury convertibles, the C300’s fuel economy is fairly typical. The BMW 430i xDrive Convertible, also equipped with a turbocharged 2.0L four-cylinder engine and all-wheel drive, achieves a similar 23 MPG combined. The Audi A5 Cabriolet, again with a 2.0L turbo and quattro all-wheel drive, sits at 27 MPG combined, giving it a slight edge. These differences, while noticeable, are unlikely to be the deciding factor for most buyers in this segment.

The Jaguar F-Type Convertible, with its more powerful six- or eight-cylinder engines, naturally comes in lower, around 20 MPG combined. Buyers looking at cars like this certainly weigh performance more heavily, so a 4 MPG deficit won’t be a deal breaker.

Tips to maximize efficiency

Avoid aggressive acceleration. The C300 is responsive enough without needing to constantly floor the accelerator. Smooth, gradual acceleration will use less gas and help you maintain better efficiency, especially in stop-and-go city driving. All Mercedes Benz fuel economy data suggests that gentle throttle inputs pay dividends.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel economy. Check your tire pressure regularly and keep them inflated to the manufacturer’s recommended specifications, found on the sticker inside the driver’s side door jamb.

Use cruise control on the highway. Maintaining a consistent speed helps optimize fuel efficiency. Cruise control minimizes variations in throttle input, contributing to better MPG on longer trips. Use “Comfort” mode on the drive selector to soften throttle response.

Reduce excess weight. Carrying unnecessary items in the trunk adds weight to the vehicle, which decreases fuel economy. Remove any unnecessary cargo to lighten the load. Be sure to store luggage inside the vehicle when possible.

Keep up with scheduled maintenance. Regular maintenance, including oil changes and air filter replacements, ensures that the engine is running efficiently. A well-maintained engine consumes less fuel. Review the services suggested under your warranty to keep the car running well. Review C300 MPG across all years.