The 14 MPG combined rating for the 2025 Mercedes-Benz AMG GT 63 4MATIC+ Coupe is not just a number. It shows the vehicle’s role as a four-door supercar that looks like a coupe. This isn’t a family hauler for economical commutes, but a high-performance machine built to thrillingly devour autobahn stretches and expertly carve through canyon roads. That 14 MPG acknowledges the twin-turbo 4.0L V8, its 630-horsepower output, and the all-wheel-drive system that delivers power with relentless efficiency, not in terms of fuel, but in propelling nearly two tons of luxury and performance with staggering force. Buyers of the AMG GT 63 Coupe look past the pump because the driving experience is their primary currency.

City and highway performance

The difference between the AMG GT 63 Coupe’s 12 MPG city and 19 MPG highway figures is entirely predictable and, for its target demographic, perfectly acceptable. In congested urban environments, the potent 4.0L V8 frequently cycles through lower gears, engages in stop-and-go traffic, and carries its considerable mass in a less efficient manner. The rapid acceleration and instant torque delivery that make city driving engaging also contribute to higher fuel consumption. On the open highway, however, the picture changes. The vehicle settles into its stride, the 9-speed automatic transmission finds its cruising gears, and the engine operates within a more efficient RPM range. Sustained high-speed cruising, which this vehicle is undeniably engineered for, allows the powertrain to achieve its best figures, though still nowhere near an economy car. What matters here is the effortless, relentless surge regardless of the driving environment, and the fuel consumed is simply the cost of doing business for such an extraordinary machine.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Mercedes-Benz AMG GT 63 4MATIC+ Coupe to be $4,150. This figure is derived using a standardized calculation method that assumes 15,000 miles of driving per year, split between city and highway conditions (55% city, 45% highway), and based on national average fuel prices, which for premium unleaded are considerably higher than regular grade. This $4,150 shows that fuel is a significant, ongoing operational expense. For the buyer choosing this AMG GT 63 Coupe, this cost is understood and factored into the overall ownership experience. They are investing in a vehicle whose performance capabilities demand a rich diet of premium fuel, and the figure itself simply quantifies a predictable aspect of owning such a high-caliber performance car. It’s part of the prestige, part of the package.

Real-world expectations

In the real world, owners of the AMG GT 63 Coupe rarely achieve the EPA’s highway ratings if they’re truly exploring the vehicle’s immense capabilities. The 19 MPG highway figure might be attainable under highly disciplined, steady-state cruising conditions, like long, flat stretches of German autobahn at a moderate pace. However, the allure of the 630 horsepower twin-turbo V8, the intoxicating exhaust note, and the immediate, brutal acceleration means most owners will find themselves accelerating far more frequently. Spirited driving, even on highways, pushing past slower traffic or enjoying winding rural roads, will inevitably push the real-world fuel economy figures closer to the 12-14 MPG range, perhaps even lower depending on just how much fun they’re having. This vehicle is designed to be driven hard, and its owners buy it for that purpose, understanding that performance and fuel efficiency are often inversely proportional. They prioritize the visceral thrill over any fractional gain at the pump. This is a machine built for exhilaration, not for optimizing gasoline consumption.

How it compares

When examining the 2025 AMG GT 63 Coupe’s 14 MPG combined, its competitors paint a similar, often less efficient, picture within the super-sedan/coupe space. Consider the Porsche Panamera Turbo S, which typically hovers around 18 MPG combined, powered by a slightly less powerful twin-turbo V8, demonstrating that even with advanced engineering, the laws of physics and performance demand their tribute. The BMW M8 Competition Gran Coupe, another direct rival delivering immense power from its twin-turbo V8, also lands in the 17 MPG combined range. Even a dedicated two-door supercar like the Ferrari Roma, with its twin-turbo V8, manages a combined 19 MPG, but that’s a lighter, fundamentally different kind of vehicle. The Aston Martin Vantage, while not a direct four-door competitor, shares a similar powertrain philosophy and comes in at a mere 18 MPG combined. The AMG GT 63 Coupe is in the expected range for a 600+ horsepower, premium performance machine. Its buyers are specifically cross-shopping these elite performers, and the slight differences in single-digit MPG figures are not a deciding factor in their purchase. For specific insights on all Mercedes Benz fuel economy data, we have a complete database. For an even more specific look at AMG MPG across all years, our dedicated page covers the full spectrum.

Tips to maximize efficiency

While efficiency isn’t the primary concern for the AMG GT 63 Coupe owner, subtle adjustments can still yield minor improvements in fuel consumption when desired. Engaging the “Comfort” drive mode softens throttle response and optimizes the transmission for smoother, more economical shifts, rather than aggressive downshifts for immediate power delivery.

Conscious use of the accelerator pedal helps. Avoiding abrupt, full-throttle accelerations and maintaining a consistent cruising speed will prevent the engine from consuming excessive fuel for short bursts of power, particularly in moderate traffic.

Regular scheduled maintenance is critical. Keeping the high-performance 4.0L V8 in peak condition ensures all its complex systems, from ignition to fuel injection, are operating as efficiently as possible, preventing unnecessary fuel waste.

Proper tire inflation is a simple but effective strategy. Under-inflated tires increase rolling resistance, forcing the engine to work harder. Keeping tires at their recommended pressure minimizes this unnecessary load.