21 MPG combined isn’t the top reason someone buys a 2019 Mercedes-Benz AMG C43 4matic Convertible. This car exists to deliver open-air thrills and AMG aggression. The fuel economy is the price of admission for this experience, tolerated by the sun-seeking, performance-oriented buyer this car attracts. They want the wind and the twin-turbo V6 under their right foot, not bragging about gas mileage.

City and highway performance

The EPA estimates for the C43 Convertible are 18 MPG in the city and 25 MPG on the highway. The city figure reflects stop-and-go driving, where the engine idles or accelerates from a standstill more. The 25 MPG highway rating is achievable during steady cruising where the 9-speed automatic transmission settles into its higher gears. These figures are based on a standardized test cycle. Aggressive acceleration, frequent braking, and higher speeds negatively impact fuel consumption.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,750 for the 2019 AMG C43 Convertible. This is calculated based on driving 15,000 miles per year, using national average fuel prices. The C43 requires premium fuel, increasing the cost. This annual fuel expense is a significant factor for prospective buyers, especially those who plan to use the car daily. While the AMG C43 driver prioritizes performance, they still need to factor this expense into their overall cost of ownership.

Real-world expectations

Don’t expect to achieve the EPA numbers consistently. Real-world fuel economy for the AMG C43 Convertible is dependent on driving style. If you use the AMG Dynamic Select system’s “Sport” or “Sport+” modes frequently, that 21 MPG combined figure will drop. A heavy right foot will force the engine to work harder, burning more fuel. A gentler driving style and using the “Comfort” mode can yield results closer to the EPA estimates, but defeats the point of owning an AMG vehicle.

How it compares

Compared to its rivals, the AMG C43’s fuel economy is average, maybe even disappointing for its class. The BMW M4 Convertible, with a more powerful engine, achieves a similar 17 MPG city and 25 MPG highway. The Audi S5 Cabriolet, with its turbocharged V6, delivers around 21 MPG combined. If you are seeking AMG MPG across all years, this model won’t stand out as economical over other similar cars. Exploring all Mercedes Benz fuel economy data shows the brand focuses on performance that could always be greener.

Tips to maximize efficiency

Minimize aggressive acceleration. The C43’s twin-turbo V6 is responsive, and it’s tempting to unleash its power. Smooth acceleration will conserve fuel. Resist flooring the accelerator unless necessary; your wallet will thank you.

Use cruise control on the highway. Maintaining a constant speed on long drives minimizes acceleration and deceleration, maximizing fuel economy. Cruise control helps maintain that speed, especially on flat stretches of highway.

Ensure proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and burn more fuel. Check your tires and inflate them to the recommended pressure as indicated on the door jamb sticker. Correct tire pressure improves fuel efficiency and handling.

Reduce idling time. Letting the engine idle consumes fuel. If you anticipate a wait of more than a minute, it’s more efficient to turn off the engine and restart it when you’re ready to go. This habit can add up to savings.

Consider using the “Comfort” drive mode for everyday commuting. While the “Sport” and “Sport+” modes prioritize performance over fuel economy, resulting in lower MPG, the “Comfort” mode softens throttle response and optimizes shift points for efficiency, making it a choice for daily driving where maximum power isn’t required.