The 2021 Mercedes-Benz AMG GT C Coupe 4.0L 8-cyl achieves 17 MPG combined, a number that likely registers very low on the priority list for its target buyer. Let’s be realistic, you don’t cross-shop a hand-built, 550-horsepower, two-seat performance coupe while obsessing over fuel bills, this is a statement car, an experience car, and practicality takes a back seat, probably somewhere behind the titanium exhaust.

City and highway performance

The EPA estimates suggest 15 MPG in the city and 19 MPG on the highway. Consider these figures baselines, achievable only through disciplined throttle control and a near-pathological aversion to engaging launch control. The AMG GT C is endlessly tempting. The 4.0-liter twin-turbo V8 is eager to unleash its fury, and the AMG SPEEDSHIFT DCT 7-speed automatic transmission is equally enthusiastic to comply. That intoxicating exhaust note and relentless surge of power encourage a heavier foot, particularly around town. Highway fuel economy will vary wildly depending on the cruising speed. A steady 70 MPH might approach the EPA estimate, but sustained runs at autobahn-worthy speeds will quickly deplete the fuel tank and your bank account.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,400 for the 2021 AMG GT C. This calculation assumes 15,000 miles of driving per year, using national average fuel prices for premium gasoline. Considering the car’s performance potential, many owners will likely exceed this mileage, especially on weekend canyon runs or track days. Those inclined to frequently test the limits of the AMG GT C will definitely exceed the $3,400 estimate each year. The reality is, the fuel bill is a negligible expense within the overall cost of ownership for a vehicle in this class. View all Mercedes Benz fuel economy data to compare to greener cars in the company’s lineup.

Real-world expectations

While the EPA provides a standardized benchmark, real-world fuel economy for the AMG GT C will be influenced by driving style, terrain, and environmental conditions. Those who primarily operate the car in urban environments, frequently navigating stop-and-go traffic, will likely see figures closer to or even below 15 MPG. Conversely, drivers who primarily use the car for longer trips on open roads might be able to achieve figures closer to 19 MPG, but only if they exercise considerable restraint. Keep your eyes fixed on the road, and your right foot light, and you’ll feel good about nearing the official estimates.

How it compares

In the rarefied air of high-performance coupes, fuel economy comparisons often seem almost irrelevant. Still, the AMG GT C stands relative to its rivals. For example, the Porsche 911 Turbo S, another benchmark performance machine, manages around 17 MPG combined, similar to the AMG GT C. However, a base Porsche 911 Carrera can achieve around 21 MPG combined. The BMW M8 Competition Coupe, with its similarly powerful V8, lands near 17 MPG combined as well. An Audi R8 V10 Performance can also deliver around 16 MPG combined. These numbers underscore the reality of extracting prodigious power from internal combustion engines, there’s always a trade-off. Many buyers interested in the AMG MPG across all years accept this tradeoff for the performance and presence this car delivers.

Tips to maximize efficiency

While squeezing every last mile from a gallon might not be the primary concern for AMG GT C owners, there are still some basic techniques that can improve fuel economy. Gradual acceleration and deceleration are much better on fuel than aggressive ‘pedal to the metal’ launches. Smooth, predictable driving will extend your miles per gallon, and help save your tires and brakes too.

Proper tire inflation is important for optimal fuel efficiency. Check your tire pressures regularly to ensure they are at the recommended levels. Underinflated tires increase rolling resistance, diminishing fuel economy and tire life.

Avoid unnecessary idling. If you anticipate being stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, and it also helps to save the earth a little.

Use the car’s driving mode selector judiciously. The AMG GT C typically offers multiple driving modes, including a Comfort or Efficiency mode. Selecting this mode can temper the engine’s responsiveness and optimize the transmission’s shift points for improved fuel economy.

Minimize aerodynamic drag by removing any unnecessary items from the roof or trunk. A roof rack or bulky cargo can negatively impact fuel economy, particularly at higher speeds. While this isn’t a top consideration for most GT C drivers, small things always help.