19 MPG combined. That’s the number anyone considering a 2017 Mercedes-Benz AMG C63 Convertible faces with its snarling 4.0L V8. It’s a figure that would be appalling in a mid-size sedan, let alone a hybrid, but it’s almost an afterthought for the buyer drawn to this open-top German muscle car. This isn’t just transportation, it’s an experience, a statement, the sound of eight cylinders playing a furious symphony only inches behind your head. The fuel bill is the price of admission.

City and highway performance

The EPA estimates you’ll see 17 MPG in the city and 22 MPG on the highway. These figures are derived from standardized testing procedures that simulate typical driving conditions. However, “typical” is a subjective term. In urban stop-and-go driving, expect the C63’s fuel consumption to be on the higher end of that 17 MPG estimate, especially if you’re prone to enjoying the V8’s strong torque at every green light. Highway numbers are more likely to align with the EPA’s 22 MPG, provided you maintain a steady cruising speed and resist the urge to pass every car in sight with a thunderous burst of acceleration. The seven-speed automatic transmission does its best to optimize fuel economy, but it’s ultimately at the mercy of the driver’s right foot.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2017 Mercedes-Benz AMG C63 Convertible is $3,050 per year. This figure is based on driving 15,000 miles annually and using the EPA’s fuel economy estimates, coupled with the national average fuel price for premium gasoline, which this high-performance engine demands. For drivers who primarily use the C63 for weekend cruises and occasional spirited drives, the actual annual fuel cost may be lower. However, those who use it for daily commuting in congested areas may well exceed the $3,050 estimate, particularly if they’re spending a lot of time in the lower gears, and fuel prices fluctuate, which can alter the true cost of ownership.

Real-world expectations

It’s very important to temper expectations when it comes to real-world fuel economy. The C63’s official figures are achievable, but they require a disciplined driving style rarely employed by its owners. This is a car designed to be enjoyed, and that enjoyment often involves exploiting the engine’s power. Expect a combined MPG closer to 15-17 if you frequently indulge in the car’s performance capabilities. Track days, spirited canyon runs, or even just aggressive commuting will significantly impact fuel consumption. Remember, you’re behind the wheel of a hand-built AMG engine. Expect the fuel gauge to reflect that.

How it compares

Compared to its rivals, the 2017 AMG C63 Convertible’s fuel economy lands where expected. The BMW M4 Convertible, for example, powered by a turbocharged inline-six, manages around 19 MPG combined as well. An Audi S5 Cabriolet, with its supercharged V6, might see slightly better numbers, hovering around 24 MPG on the highway. Even the Lexus RC F, boasting a naturally aspirated V8, often mirrors the C63’s MPG in real-world scenarios. While some competitors offer marginally better fuel economy, the difference is often negligible in the grand scheme of ownership for the driver drawn to this segment. Those who prioritize ultimate efficiency would likely be looking at other vehicle classes entirely. You can explore AMG MPG across all years to compare performance across different models.

Tips to maximize efficiency

While the AMG C63 isn’t exactly known for its fuel-sipping abilities, a few techniques can help you get more range out of each tank. First, use the car’s “Comfort” driving mode when possible. This mode remaps the throttle response for smoother acceleration, reducing the temptation to aggressively tap into the engine’s power. This doesn’t mean you have to drive like a saint, but being mindful of your acceleration habits can make a difference.

Pay attention to tire pressure. Properly inflated tires reduce rolling resistance, improving fuel economy. Check your tire pressure regularly and maintain the recommended levels. This is even more important in a high-performance car like the C63, where optimal tire performance plays a role in both handling and efficiency.

Minimize idling time. Excessive idling consumes fuel without covering any distance. If you anticipate a long wait, such as in a drive-thru or while waiting to pick someone up, turn off the engine. While the fuel savings may seem small, they accumulate over time.

Finally, consider sticking to premium fuel from reputable brands. While some may be tempted to use lower-grade fuel, the C63’s high-performance engine is designed to run on premium. Using lower-grade fuel can reduce performance and potentially damage the engine over time, leading to costly repairs and negating any potential savings at the pump. It’s always important to follow the manufacturer’s recommendations. If you’re curious about other models in the lineup, you can review all Mercedes Benz fuel economy data.