The EPA estimates the 2019 Mercedes-Benz AMG C63 Convertible gets 20 MPG combined, a figure that’s about as relevant to its typical owner as the price of tea in China. This isn’t a car bought for saving gas. This is a visceral, raucous, and utterly indulgent performance car masquerading as a luxurious convertible. Its naturally aspirated V8 soundtrack and explosive acceleration are the price of admission, and those who can afford the C63 are rarely deterred by the fuel bill.

City and highway performance

The EPA further breaks down the C63’s fuel economy, revealing 17 MPG in the city and 24 MPG on the highway. The urban figure reflects the realities of stop-and-go traffic, where the AMG’s potent engine spends more time idling or accelerating from a standstill, conditions that punish fuel consumption. The highway number, however, demonstrates what’s possible when the C63 is allowed to cruise, although restraint can be difficult with such readily available power. Expect the highway MPG to tumble rapidly if “cruising” involves frequent applications of the accelerator to overtake slower traffic with a thunderous roar.

Annual fuel cost

That glorious V8 requires premium fuel, and if you follow the EPA’s usage model of 15,000 miles per year, you’re looking at an estimated annual fuel cost of $2,900. This figure is based on national average fuel prices and driving habits (55% city, 45% highway). Of course, actual fuel costs vary greatly depending on local fuel prices and individual driving styles. A lead-footed AMG driver racking up mostly city miles will almost certainly exceed this estimate, while someone with a lighter touch and more highway miles might come in slightly under.

Real-world expectations

While the EPA estimates offer a standardized benchmark, real-world fuel economy can be significantly different. Many C63 owners report figures that fall slightly below the EPA’s numbers, especially in mixed driving conditions. The car’s performance-oriented nature encourages spirited driving, which inevitably impacts fuel efficiency. Frequent use of the “Sport+” or “Race” modes, which sharpen throttle response and hold gears longer, will further reduce MPG. The C63’s character is about driving pleasure, not fuel conservation, and most owners prioritize the former.

How it compares

When considering competitors, the fuel economy picture becomes clearer. The BMW M4 Convertible, with its turbocharged inline-six, achieves a slightly better 20 MPG city / 26 MPG highway (22 MPG combined). The Audi RS5 Cabriolet, also powered by a turbocharged V6, posts 18 MPG city / 26 MPG highway (21 MPG combined). The difference, while noticeable on paper, is unlikely to be a deciding factor for most buyers in this segment. These vehicles are all about performance and experience, and a few MPG here or there rarely sways a decision driven by emotion and brand loyalty. Those hyper-focused on efficiency might consider all Mercedes Benz fuel economy data and explore other options.

Tips to maximize efficiency

While saving gas might not be top of mind for the average AMG C63 owner, there are steps you can take to improve fuel economy without sacrificing too much driving enjoyment. Avoiding excessive idling is a simple and effective measure, as is resisting the urge to launch from every stoplight. Smooth, consistent acceleration is far more fuel-efficient than aggressive bursts of speed.

Use the car’s drive modes strategically. “Comfort” mode softens throttle response and encourages earlier upshifts, promoting fuel efficiency during mundane commutes. While tempting to engage “Sport+” or “Race” mode at every opportunity, reserving them for spirited drives or open stretches of road can significantly improve overall MPG.

Regular maintenance, including properly inflated tires and timely oil changes, ensures the engine operates at peak efficiency. Low tire pressure increases rolling resistance, forcing the engine to work harder and consume more fuel. Worn-out spark plugs or a dirty air filter can also negatively impact fuel economy.

Consider your driving environment. Highway driving generally yields better fuel economy than city driving, due to the consistent speeds and fewer stops. Plan your routes to avoid congested areas whenever possible, and make use of cruise control on long highway stretches to maintain a steady speed.

Finally, understand the impact of aftermarket modifications. While performance upgrades like exhaust systems or ECU tunes can enhance power, they often come at the expense of fuel efficiency. Sticking with the factory settings ensures the car operates within its intended parameters, optimizing both performance and fuel economy. Don’t forget to explore AMG MPG across all years for a broader view of the model’s fuel efficiency.