The 2024 Mercedes-Benz CLE450 4matic Convertible gets 26 MPG combined. While this number won’t win any hypermiling contests, it’s an acceptable trade-off for the open-air thrills, refined luxury, and strong performance this car delivers. This car is for people who prioritize the experience of driving a stunning convertible with a smooth inline-six engine more than squeezing every last mile from a gallon of premium fuel. These drivers understand that engaging driving dynamics and head-turning style come at a price, and fuel economy is part of that.

City and highway performance

The EPA estimates that the CLE450 Convertible achieves 23 MPG in the city and 32 MPG on the highway. The city figure reflects stop-and-go conditions where the 3.0L inline-six and nine-speed automatic transmission work harder, particularly during quick starts from traffic lights. On the open road, the CLE450’s mild-hybrid system, which provides a small electric boost during acceleration and allows for coasting, helps improve the highway MPG figure. That extra boost from the electric motor improves responsiveness too, so fuel economy isn’t at the cost of power.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 Mercedes-Benz CLE450 4matic Convertible at $2,250. This figure is based on driving 15,000 miles per year and using the EPA’s estimate of per-gallon fuel prices. Remember that this is an average; specific fuel costs will vary depending on individual driving habits, local fuel prices, and the percentage of city versus highway driving. Driving more aggressively or spending more time in congested urban environments will push that annual cost higher.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy often differs. Driving style, road conditions, and even tire pressure will cause some variation. Owners who prioritize performance and frequently use the CLE450’s ample power will likely see figures closer to the lower end of the EPA range, while those who drive more conservatively can realistically expect to match or slightly exceed the EPA’s highway estimate. If you keep meticulous driving records, you’ll soon know what to expect in your specific driving environment.

How it compares

Compared to its key competitors, the 2024 Mercedes-Benz CLE450 4matic Convertible’s fuel economy is what you would expect. The BMW Z4 M40i, with its inline-six, achieves a similar 26 MPG combined. The Porsche 718 Boxster, equipped with its base turbocharged four-cylinder, gets slightly better fuel economy, with 25 MPG combined based on EPA testing. The CLE450 offers more luxurious features and comfortable seating for longer trips than a Miata or Z4, so its fuel economy is easily justified for those who choose it.

Tips to maximize efficiency

Take advantage of the selectable drive modes. The “Eco” mode adjusts the throttle response and shift points to prioritize fuel efficiency. This can be especially useful during regular commutes or when cruising on the highway. Switching to the “Comfort” or “Sport” modes for spirited drives will reduce those gains.

Be sure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and follow the recommendations in the owner’s manual or on the driver’s side door jamb. This small act can have a measurable impact over time.

Drive smoothly, accelerating and braking gently. Aggressive driving habits burn more fuel. Anticipate traffic flow and try to maintain a consistent speed when you can. Avoid abrupt stops and starts, which can decrease efficiency. Gentle, controlled inputs are key to maximizing your MPG.

Consider the weight you’re carrying. Carrying unnecessary cargo adds weight to the vehicle, which directly impacts fuel economy. Remove any items from the trunk or rear seats that you don’t need regularly. A lighter car is a more efficient car.

Keep the top up when possible. While enjoying the open air is a key part of the convertible experience, driving with the top down at higher speeds increases aerodynamic drag, which reduces fuel economy. Keep the top up when you can, especially on the highway, to minimize wind resistance and improve your MPG. For all Mercedes Benz fuel economy data, or to compare CLE450 MPG across all years, check out our other pages.