20 MPG combined is a figure that will make absolutely zero difference to anyone in the market for a 2020 Mercedes-Benz AMG C63 Convertible. This isn’t a car bought on spreadsheets or logical justifications; it’s an emotional purchase driven by a desire for sun-soaked performance and a soundtrack that would make Beethoven weep with envy. The C63 Convertible is for drivers who relish the experience of driving above all else, and who are perfectly happy to trade fuel efficiency for the thrill of a hand-built V8.

City and highway performance

The EPA estimates of 17 MPG in the city and 24 MPG on the highway reflect the C63’s dual nature. The urban figure is a realistic expectation when dealing with stop-and-go traffic, contributing to the hefty fuel bill. However, the highway number shows that the well-engineered 9-speed automatic transmission and the engine’s inherent efficiency at cruising speeds can return respectable results. But let’s be honest, very few C63 owners are solely focused on maximizing fuel economy during their highway excursions. The temptation to unleash the power on an open stretch of road is simply too great, and the fuel consumption will rise accordingly.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Mercedes-Benz AMG C63 Convertible at $2,900. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using national average fuel prices. Consider this a baseline. Aggressive driving or a higher percentage of city miles will significantly increase this expense. This cost is a drop in the bucket for the target demographic, who have more than enough disposable income to offset the AMG’s thirst for premium fuel.

Real-world expectations

Forget the EPA estimates because real-world MPG in a C63 Convertible is heavily dependent on driving style. Owners who prioritize enjoying the car’s performance will likely see numbers closer to the city estimate, or even lower. Spirited acceleration, frequent downshifts, and extended periods spent in Sport+ mode will all take a toll. Conversely, those who exercise restraint and spend a significant amount of time on the highway can approach the EPA’s 24 MPG figure, but this requires exceptional self-control in a machine engineered to deliver unparalleled performance.

How it compares

Compared to its rivals, the C63 Convertible’s fuel economy is typical in the high-performance convertible segment. The BMW M4 Convertible, with its turbocharged inline-six, achieves around 19 MPG combined in real-world driving. The Audi RS5 Cabriolet, offering all-wheel-drive grip, returns a similar 18-20 MPG. These differences are arguably negligible for the buyer willing to spend this amount of money on a convertible, who may be interested in viewing AMG MPG across all years. The C63’s hand-built V8 offers a unique driving experience that the turbocharged six-cylinder engines simply can’t replicate, and many enthusiasts view it as worth the fuel-economy penalty. For those interested in exploring information on the Mercedes-Benz lineup, detailed data is available on all Mercedes Benz fuel economy data.

Tips to maximize efficiency

Avoid aggressive acceleration. The AMG C63’s V8 is addictive, but every hard launch and full-throttle burst burns fuel at an alarming rate. Smooth, progressive acceleration will significantly improve fuel economy, even if it requires willpower.

Use the car’s drive modes strategically. Comfort mode softens throttle response and encourages earlier upshifts, maximizing efficiency in daily driving. Save Sport and Sport+ modes for when you truly want to enjoy the car’s performance on twisty roads or open highways.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, leading to decreased fuel economy. Regularly check your tire pressures and ensure they are at the recommended levels for optimal efficiency and handling.

Minimize idling. Excessive idling wastes fuel and contributes to unnecessary emissions. If you’re stopped for more than a minute or two, turn off the engine. Though, understand that restarting the engine will also burn fuel. Use your judgement to minimize fuel burn depending on how long you expect to be idling.

Regular maintenance is critical for peak performance and efficiency. Follow the recommended service schedule in your owner’s manual to ensure that your engine is running optimally and that all components are in good working order.