20 MPG combined testifies to the power of a turbo-charged four-cylinder and a potent electric motor in a high-performance SUV wearing an AMG badge. This isn’t a fuel miser. It’s an engineering marvel that manages to deliver supercar acceleration while consuming less fuel than its predecessors and many of its brute-force rivals.

City and Highway Performance

Diving deeper into the EPA’s numbers reveals 19 MPG city and 21 MPG highway, figures that show the nature of this plug-in hybrid performance monster. In the urban jungle, the E Performance system shines. The electric motor, independently capable of propelling the GLC63 S E at lower speeds, not only provides immediate torque but also significantly reduces the reliance on the gasoline engine for stop-and-go traffic. This is where the 2.0L 4-cylinder’s integration becomes crucial; it’s not always on, working to optimize power delivery and, as a byproduct, fuel consumption. Highway driving at 21 MPG is where the inherent drag and weight of a performance SUV, even a hybrid one, become more apparent. Here, the four-cylinder does more of the heavy lifting, maintaining higher speeds with less opportunity for electric-only coasting. Yet, even 21 MPG on the highway for a vehicle delivering well over 600 horsepower is impressive, especially when considering the performance capabilities at the driver’s disposal.

Annual Fuel Cost

The EPA’s estimated annual fuel cost for the 2025 Mercedes-Benz AMG GLC63 S E Performance (coupe) is $2,900. This figure is calculated based on an average driving distance of 15,000 miles per year and national average fuel prices. For a prospective buyer of this particular AMG, this cost is not likely to be a deterrent. Someone shelling out well over six figures for a high-performance luxury SUV is prioritizing visceral driving dynamics, exclusivity, and cutting-edge technology over minimizing their annual fuel bill. The $2,900 represents a small fraction of the ownership cost. What it does indicate is the efficiency gained through its turbo-charged engine with electric motor. Compare this to a non-hybrid performance SUV from just a few years ago, and the annual fuel cost would likely be considerably higher for similar performance levels. It’s a reflection of technological progress rather than a primary purchase motivator.

Real-World Expectations

Expectations for fuel economy in the 2025 AMG GLC63 S E Performance (coupe) are complex and deeply intertwined with driving style and charging habits. The EPA’s 20 MPG combined is an average, and like all averages, it can be significantly influenced by how the vehicle is used. Deploying all 671 horsepower frequently, as many AMG owners are inclined to do, will naturally see figures dip. This car’s purpose is performance, and that performance comes at an energy cost. However, for those who diligently charge the 6.1 kWh battery and use its electric-only range for daily commutes or errands, the real-world combined MPG can approach, or even exceed, the EPA’s estimates. The vehicle’s intelligence in blending power sources is remarkable. The GLC63 S E Performance operates on an adaptive strategy, prioritizing electric drive when suitable, engaging the gasoline engine for peak performance or when the battery charge is low. This smooth transition is fundamental to its character.

How it Compares

When stacked against its primary rivals, the 2025 AMG GLC63 S E Performance Coupe occupies a unique space, largely due to its plug-in hybrid architecture. Consider the Porsche Macan GTS, which, with its twin-turbo V6, delivers approximately 19 MPG combined. The BMW X4 M Competition, another direct competitor, also hovers around 17-18 MPG combined from its inline-six. The Alfa Romeo Stelvio Quadrifoglio with its Ferrari-derived V6 typically achieves around 19 MPG combined. The AMG, at 20 MPG combined, is not dramatically better on paper than some of these non-hybrid alternatives, but its advantage lies in its electric-only capability and the sheer boost in performance it offers. For the buyer of an AMG, the decision often comes down to brand loyalty, dynamic prowess, and technological advancement. The AMG GLC63 S E Performance Coupe offers these in abundance, and it also provides a tangible, albeit secondary, benefit of improved efficiency over traditional high-performance SUVs thanks to its hybrid powertrain. It’s a pragmatic nod to the future without compromising the visceral AMG experience. You can find more Mercedes Benz fuel economy data here.

Tips to Maximize Efficiency

Regularly charging the 6.1 kWh battery is important. Maximizing the electric-only range on short trips or daily commutes will significantly reduce gasoline consumption, especially in city driving scenarios where the electric motor is most efficient.

Use the different drive modes strategically. “Electric” mode prioritizes all-electric driving, while “Comfort” mode intelligently blends electric and gasoline power for optimal everyday efficiency. Save “Sport+” or “Race” modes for when you truly want to unleash the car’s full performance potential, accepting the corresponding increase in fuel consumption.

Employ regenerative braking effectively. The vehicle’s system recovers energy during deceleration, sending it back to the battery. Anticipating stops and coasting, rather than abrupt braking, maximizes this energy recovery.

Maintain proper tire pressure and follow the recommended service schedule. These minor details have an impact on overall efficiency and ensure the complex hybrid system operates at its peak.

Minimize unnecessary weight. While not always practical for an SUV, removing heavy items from the cargo area when not in use can contribute to slightly better fuel economy, as the powertrain has less mass to move.