The 2017 Mercedes-Benz AMG C43 4matic Convertible gets 22 MPG combined, a number that’s unlikely to deter a buyer seeking a potent open-air experience. This car isn’t purchased for its fuel economy; it’s a statement, a lifestyle choice, and a direct injection of performance into the everyday. Fuel efficiency, while a consideration, is less important than the intoxicating sound of the AMG-tuned V6 and the wind in your hair.

City and highway performance

The EPA estimates are 19 MPG in the city and 26 MPG on the highway. These numbers reflect the inherent characteristic of the C43: a car capable of civilized commuting but always eager to unleash its performance. Stop-and-go traffic will inevitably bring the city MPG down, as the responsive throttle and quick-shifting nine-speed automatic encourage spirited driving. On the open road, the C43 settles into a more relaxed gait, allowing for the higher highway MPG, though even then, a heavy foot can easily negate any fuel-saving efforts. The 9-speed automatic does its best to keep the engine in its most efficient range, but ultimately the driver’s habits dictate the real-world results.

Annual fuel cost

According to the EPA, the annual fuel cost for operating the 2017 Mercedes-Benz AMG C43 4matic Convertible is $2,650. This figure is based on driving 15,000 miles per year and using national average fuel prices. Your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and local fuel prices.

While $2,650 might seem steep compared to more economical cars, it’s a price many C43 owners are willing to pay for the performance and prestige the vehicle offers.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy can change significantly. Drivers who accelerate aggressively and frequently use Sport or Sport+ modes should expect to see numbers closer to the city estimate, even on the highway. On the other hand, those who prioritize smooth acceleration and use the Eco mode (if equipped) may be able to nudge the highway figure closer to 28 or even 29 MPG. The C43’s fuel economy is highly susceptible to the driver’s individual style.

It’s best to temper expectations and enjoy the ride, rather than obsessing over every tenth of a mile per gallon.

How it compares

Among performance convertibles, the AMG C43 has similarly thirsty peers. For example, the BMW 440i Convertible, with its inline-six, typically achieves around 21 MPG combined. Stepping up to a V8-powered Audi S5 Cabriolet yields even lower figures, often hovering around 18 MPG. Even with updated drivetrains that may provide a slight increase in advertised fuel econonomy, the AMG’s numbers overall continue to be relatively competitive. The C43’s 22 MPG represents a reasonable compromise between performance and fuel consumption within its segment. Potential buyers should carefully weigh the importance of fuel economy against the desired level of performance and handling before making a decision.

For more information on all Mercedes Benz fuel economy data, browse our website.

Tips to maximize efficiency

Adopt a smooth driving style. The AMG C43 is responsive, but aggressive acceleration and braking waste fuel. Gentle and progressive throttle inputs will allow the transmission to shift smoothly and keep the engine operating in its most efficient range.

Monitor tire pressure regularly. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure at least once a month and ensure it matches the recommended pressure listed on the doorjamb.

Limit idling time. Letting the engine idle for extended periods consumes fuel without covering any distance. If you expect to wait longer than a minute, turn off the engine.

Consider using a fuel additive, especially with higher-octane gasoline that can sometimes leave deposits. A quality fuel injector cleaner can help maintain optimal fuel delivery and combustion, promoting better fuel economy over time.

Plan your routes strategically. Avoiding congested areas and opting for routes with fewer stop-and-go situations can significantly improve fuel economy, especially in urban environments. Also, consider driving with your top up, as doing so adds weight and drag to the vehicle, which reduces efficiency.

Ultimately, the 2017 AMG C43 buyer likely made peace with its efficiency numbers long ago after reading AMG MPG across all years. The appeal is the experience, the sound, and the open-air thrill, not the pursuit of ultimate fuel efficiency.