17 MPG combined isn’t going to win any awards, but for the 2018 Mercedes-Benz AMG GT C Roadster, it’s a price most owners are willing to pay. This car isn’t bought for maximizing fuel efficiency; it’s a statement, a thrill ride, and a status symbol all rolled into one sleek, handcrafted package. The hand-built 4.0L V8 engine, producing a hefty 550 horsepower, is the heart and soul of this machine, and that kind of performance demands fuel. Prospective owners aren’t overly concerned with trips to the gas station; they’re chasing open roads, exhilarating acceleration, and the unmistakable roar of an AMG engine.

City and highway performance

While the combined EPA rating sits at 17 MPG, the breakdown reveals 15 MPG in the city and 20 MPG on the highway. The city figure reflects the reality of stop-and-go traffic, where the AMG GT C Roadster’s potent engine spends more time idling or accelerating from a standstill. The highway number, however, demonstrates that the car can achieve reasonable efficiency when cruising at steady speeds. Even then, the temptation to exploit the car’s immense power is always present, which can easily negate any fuel-saving efforts. The AM-S7 automatic transmission does its best to balance performance and efficiency, but ultimately, the driver’s right foot dictates the true consumption.

Annual fuel cost

According to the EPA estimates, the annual fuel cost for the 2018 Mercedes-Benz AMG GT C Roadster is $3,400. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving, and using the national average fuel price for premium gasoline. Keep in mind that fuel prices fluctuate, and individual driving habits can significantly impact this number. Those who primarily drive in the city or frequently engage in spirited driving will likely exceed this estimate, while those who predominantly cruise on the highway might fare slightly better. However, for a car like this, the fuel cost is a relatively small consideration compared to the overall ownership experience.

Real-world expectations

The EPA estimates provide a useful baseline, but real-world fuel economy for the AMG GT C Roadster can vary widely. Drivers who frequently exploit the car’s performance capabilities will likely see numbers closer to the city estimate, or even lower. Conversely, those who adopt a more relaxed driving style on the highway might achieve slightly better than the EPA’s 20 MPG rating. Factors such as traffic conditions, road grades, and even tire pressure can all influence fuel consumption. Ultimately, it’s safe to assume that most owners will average somewhere around the combined 17 MPG figure, but with the potential for significant deviations depending on their individual driving habits.

How it compares

Compared to its competitors, the AMG GT C Roadster’s fuel economy is, unsurprisingly, on the lower end. The Porsche 911 Carrera S Cabriolet, for instance, achieves around 20 MPG combined with its 3.0L turbocharged engine. The Audi R8 Spyder V10, despite its larger engine, manages a similar 16 MPG combined, showcasing Audi’s fuel-saving technology. Even some larger luxury models like the BMW M850i Convertible get closer to 20 MPG combined and 25mpg on the highway. These differences matter to buyers cross-shopping the AMG. Understanding these numbers underscores that buyers aren’t prioritizing efficiency in this segment. It reinforces that the AMG GT C Roadster is about performance and presence, accepting the fuel cost as part of the package.

Tips to maximize efficiency

While fuel economy might not be the primary concern for AMG GT C Roadster owners, there are still steps that can be taken to improve efficiency. Smooth and gradual acceleration is key. The AMG’s powerful engine responds eagerly to throttle inputs, but avoiding abrupt acceleration and hard braking can significantly reduce fuel consumption.

Proper tire inflation is another often-overlooked factor. Maintaining the correct tire pressure, as specified in the owner’s manual, can minimize rolling resistance and improve fuel economy by a small but measurable amount. Check your tires regularly and adjust pressure as needed.

Use the car’s driving modes intelligently. The AMG GT C Roadster offers various driving modes that adjust the engine, transmission, and suspension settings. Selecting a more economy-focused mode, such as “Comfort” or “Eco,” can help optimize fuel efficiency during everyday driving.

Minimize idling time. Letting the engine idle for extended periods consumes fuel without covering any distance. When stopped for more than a minute or two, it’s best to turn off the engine to save fuel. This is especially relevant in congested city traffic.

Regular maintenance is critical for optimal performance and efficiency. Keeping the engine properly tuned, replacing air filters as recommended, and using the correct type of engine oil can all contribute to improved fuel economy over the long term. Consult the maintenance schedule in your owner’s manual for specific recommendations.

For more, check out all Mercedes Benz fuel economy data. You can also explore AMG MPG across all years to see the evolution of this performance brand.