19 MPG combined for the 2025 Mercedes-Benz AMG GT 63 S E Performance coupe declares its intent. This figure shows a performance hybrid that delivers acceleration while offering a nod to efficiency. It is a bold declaration from Affalterbach, suggesting that electrifying AMG’s most potent grand tourer can elevate its capabilities without entirely abandoning responsible fuel consumption, at least in the abstract sense. This car is not about frugality; it is about delivering a ballistic driving experience with a high-voltage punch, where the electric motor’s instant torque compliments the twin-turbo V8’s brutal power delivery.

City and Highway Performance

The AMG GT 63 S E Performance records 16 MPG in the city and 22 MPG on the highway. In city driving, the strong 4.0L twin-turbo V8, augmented by the electric motor, means immediate, staggering acceleration is always on tap. The ability of the electric motor to provide smooth propulsion off the-line helps mitigate some of the traditional V8 thirst at lower speeds, especially during start-stop traffic. However, anyone who has driven an AMG knows that the temptation to exploit the full combined 805 horsepower is irresistibly strong, and doing so will quickly see the 16 MPG figure plummet.

On the highway, the 22 MPG rating is a more attainable figure, assuming a disciplined right foot. The 9-speed automatic transmission, combined with the V8’s ample torque, allows for relaxed cruising at highway speeds with the engine revving low. The electric motor can also provide assistance, or even propel the car for short distances in electric-only mode, further conserving fuel during steady-state driving. However, the true joy of this vehicle on the highway comes from its effortless, relentless surge past slower traffic, a maneuver that inevitably dips into the high-octane reserves.

Annual Fuel Cost

The EPA estimates an annual fuel cost of $3,050 for the 2025 Mercedes-Benz AMG GT 63 S E Performance. This figure is based on an assumption of driving 15,000 miles per year, with 45% of those miles driven on the highway and 55% in the city, and using national average fuel prices. For a vehicle with this level of performance and complexity, the $3,050 annual cost is in line with other high-performance luxury cars, often even exceeding the fuel costs of some less powerful but equally thirsty pure internal combustion engines. Buyers of this caliber of vehicle are rarely concerned with fuel costs as a primary purchasing factor, they prioritize the unparalleled driving dynamics and the raw emotional appeal of a performance hybrid that delivers immediate gratification.

Real-World Expectations

In real-world driving, owners of the AMG GT 63 S E Performance will find themselves consistently below the EPA’s combined 19 MPG, likely closer to the 16 MPG city figure or even lower during spirited excursions. This is a car designed to be driven hard, and its powertrain actively encourages aggressive driving. The instant torque delivery from the electric motor, integrated with the explosive power of the twin-turbo V8, creates a driving experience that is addictive. Exploiting this capability, especially in the vehicle’s more aggressive drive modes, inevitably means burning more fuel. The E Performance designation hints at efficiency as a secondary benefit of electrification, its primary purpose is power enhancement and dynamic capability. The owner who embraces this AMG’s character will rarely, if ever, see their fuel economy match the EPA rating.

How it Compares

When considering the 2025 AMG GT 63 S E Performance, its competitors exist in a rarefied atmosphere where fuel economy is a footnote to performance. Take the Porsche Panamera Turbo E-Hybrid, which is rated at an impressive 20 MPG combined (EPA estimates for 2024 model, 4.0L V8). While slightly more efficient, the Panamera offers a different driving experience, leaning more towards luxury grand touring with incredible speed, whereas the AMG GT 63 S E Performance is undeniably more track-focused and aggressive. The BMW M8 Gran Coupe, with its 4.4L twin-turbo V8, manages 17 MPG combined, underscoring the AMG’s relative efficiency advantage born from its hybrid powertrain. Even a pure ICE supercar like the Ferrari Roma, with a smaller 3.9L V8, barely nudges ahead with 19 MPG combined, but at a significantly higher ownership cost and a far grander statement. The owner choosing the AMG GT 63 S E Performance is doing so for its unique blend of power, technology, and AMG’s distinct driving DNA, not because it is a fuel sipper. Compared to these rivals, the AMG MPG across all years for this performance hybrid holds its own, proving that electrification can deliver both performance and a comparative edge in fuel economy.

Tips to Maximize Efficiency

To maximize efficiency in the AMG GT 63 S E Performance, judicious use of its electric-only driving mode is crucial. For shorter commutes or navigating congested urban areas, selecting the “Electric” drive mode allows the vehicle to operate solely on battery power, significantly reducing fuel consumption until the battery depletes or higher power demands are made.

Employing a smooth and progressive driving style greatly influences fuel economy. Avoiding aggressive acceleration and abrupt braking, even when the power is irresistibly available, allows the hybrid system to operate more efficiently, conserving both fuel and battery charge through regenerative braking.

Actively monitoring the onboard energy flow display helps drivers understand when the system is recuperating energy during deceleration or deploying electric boost. This feedback can encourage a more efficient driving style, allowing the driver to optimize the blend of electric and combustion power.

Regular maintenance, including proper tire inflation and timely service, ensures the vehicle operates at its peak efficiency. The complex powertrain of the AMG GT 63 S E Performance benefits significantly from adherence to the manufacturer’s maintenance schedule for all Mercedes Benz fuel economy data.