The 2023 Mercedes-Benz C300 Convertible 2.0L 4-cyl gets 24 MPG combined, which is fine for a stylish, open-air luxury vehicle, but won’t win any hypermiling awards. These cars prioritize the driving experience over fuel savings, and most buyers seek an enjoyable drive, regarding fuel economy as a secondary concern when purchasing a luxury convertible.

City and highway performance

The EPA estimates the C300 Convertible gets 21 MPG in the city and 29 MPG on the highway. In stop-and-go urban driving, the 2.0L turbocharged engine works harder and the automatic transmission shifts frequently, resulting in the lower city MPG. The C300 performs best on the highway; its powertrain cruises comfortably, using the 9-speed automatic transmission to optimize fuel consumption at higher speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Mercedes-Benz C300 Convertible at $2,400. This is based on driving 15,000 miles per year and using average national fuel prices. Your actual fuel costs will depend on your driving habits, the type of fuel you purchase, and local fuel prices. Premium fuel is recommended for optimal performance. However, $2,400 is a reasonable benchmark for prospective owners.

Real-world expectations

EPA figures are a useful guide, but real-world MPG can vary. Aggressive driving, frequent short trips, and extended idling will decrease fuel economy. However, gentle acceleration, consistent highway speeds, and diligent maintenance can help you get closer to the EPA’s estimates.

Owners who prioritize fuel economy can likely see numbers close to the EPA rating, while those more focused on maximizing the C300’s performance may see slightly lower results.

How it compares

The C300 Convertible’s fuel economy is as expected when compared to its rivals. The BMW 430i Convertible, powered by a 2.0L turbocharged engine, gets a similar 25 MPG combined. The Audi A5 Cabriolet, another key competitor, also attains around 24 MPG. All these convertibles are built to a higher standard of luxury, which is generally a tradeoff with higher fuel economy.

Owners are often considering style, quality, and performance over fuel efficiency, and the C300 Convertible strikes a reasonable balance.

Tips to maximize efficiency

The C300 Convertible’s engine works best with smooth and progressive acceleration. Avoid sudden bursts of speed and try to anticipate traffic flow to minimize unnecessary braking; careful driving will positively impact your MPG.

Ensure your tires are inflated to the recommended pressure, which you can find on the sticker inside the driver’s side door. Underinflated tires increase rolling resistance, which reduces fuel efficiency. Regular tire pressure checks are a simple way to save fuel.

The C300’s automatic transmission is designed to optimize fuel economy. Letting it shift naturally, instead of shifting manually, will help keep the engine in its most efficient operating range, because the car’s computers are well-tuned to determine the best gear.

Regular maintenance, including oil changes and air filter replacements, is essential for optimal fuel economy. A clean air filter ensures the engine breathes freely, and fresh oil reduces friction and improves overall efficiency. Refer to your owner’s manual for recommended service intervals. You can view all Mercedes Benz fuel economy data to see how various models compare.

Finally, for maximum economy, or just a break from the sun, consider raising the top. Convertibles experience a dip in fuel economy with the top down at highway speeds because it creates more drag than driving with the top up. If you’re driving long distances, keeping the top up will allow you to drive a bit further between fill-ups. You can compare C300 MPG across all years to see if model year plays a major factor.