The 2018 Mercedes-Benz AMG C43 4matic Convertible gets 22 MPG combined. This number won’t win any hypermiling contests but is reasonably acceptable when weighed against the exciting performance this convertible provides. This car isn’t for the faint of heart, or those whose main concern is getting every last mile from a gallon of premium fuel. Instead, it’s a compromise for open-air fun and the seductive sound of an AMG-tuned engine.

City and highway performance

The EPA estimates 19 MPG in the city and 26 MPG on the highway for the C43 Convertible. The city number, heavily influenced by stop-and-go traffic and the temptation to use the responsive throttle, is the more realistic figure for daily drivers. The highway MPG, while achievable, requires some restraint. The car begs to be driven spiritedly, and sustained high-speed cruising will likely dip below the official rating. The 9-speed automatic transmission helps in both scenarios, offering quick shifts when pushed and smooth, efficient operation when driving at a steady pace.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 Mercedes-Benz AMG C43 4matic Convertible is $2,650. This estimate is based on driving 15,000 miles per year and using national average fuel prices. Given that the C43 requires premium fuel, which fluctuates in price, your real-world expenses could be higher or lower than this figure depending on driving habits and regional fuel rates.

Real-world expectations

Few AMG C43 Convertible owners are mainly driven by fuel efficiency. They are drawn to the car’s performance, luxury, and open-top experience. The expected MPG is simply a cost of owning the car. Enthusiastic driving will likely push the average downwards, perhaps into the high teens. Gentle cruising on longer road trips, however, can get numbers closer to the 26 MPG highway rating. Ultimately, the car’s performance, combined with the driver’s personal tendencies, determines the final fuel bill.

How it compares

Many factors influence fuel consumption, and with this class of vehicle it often takes a back seat to other considerations. Still, it’s good to know how the C43 compares to other vehicles in its class. The BMW M4 Convertible, also powered by a six-cylinder engine, posts an EPA-estimated 16 MPG city and 23 MPG highway. The Audi S5 Cabriolet, another direct competitor, achieves a similar 21 MPG combined. These numbers highlight a common truth: high performance, especially when combined with the extra weight and aerodynamic issues of a convertible, isn’t usually synonymous with great fuel economy. Review AMG MPG across all years to see how this model compares with other AMG vehicles.

Tips to maximize efficiency

The AMG C43’s 3.0L turbocharged V6 is responsive, yet surprisingly fuel-efficient when driven with restraint. Avoid aggressive acceleration and heavy braking to save fuel. Anticipating traffic flow and maintaining a consistent speed, especially on the highway, can significantly improve your MPG.

Use the car’s drive modes. The “Comfort” mode reduces throttle response and optimizes the transmission for fuel efficiency, making it better for everyday driving. When you want more performance, “Sport” and “Sport+” deliver the full AMG experience, but you’ll see a decrease in fuel economy.

Make sure that your tires are properly inflated. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly and follow the manufacturer’s recommended settings, which can be found on the driver’s side doorjamb.

Reduce unnecessary weight. Carrying extra cargo in the trunk adds weight. While it may not seem like a huge factor, every pound counts when striving for less gas use. Remove items that are not essential for your journey.

Choose your route carefully. Opt for routes with fewer stop signs and traffic lights, even if they are slightly longer. A smooth, consistent speed is more efficient than repeatedly accelerating and decelerating. Look over all Mercedes Benz fuel economy data for other fuel saving tips.