The 2025 Mercedes-Benz AMG GT 63 4matic Plus 4.0L 8-cyl isn’t concerned with setting new efficiency benchmarks, 17 MPG combined, according to the EPA, is simply a byproduct of unleashing nearly 600 horsepower from a twin-turbo V8 in a grand touring sedan designed to devastate autobahns and embarrass sports cars. This isn’t a vehicle for the fuel-conscious, it’s a statement of opulent performance, where the visceral thrill of acceleration and the intoxicating growl of the engine take absolute precedence over the numbers at the pump. Its buyers understand this implicit trade-off, embracing the vehicle for its unique blend of crushing speed, luxury, and everyday usability, knowing full well that such extravagance comes with an appetite for premium fuel.

City and Highway Performance

The EPA’s 15 MPG city rating for the AMG GT 63 4matic Plus is a stark reminder of its true nature. Navigate stop-and-go traffic, engage in spirited take-offs from lights, or simply revel in the throttle response in urban environments, and the fuel gauge will fall with a casual indifference. This is a heavy, powerful machine with a wide powerband designed for instant gratification, and efficiency suffers accordingly when faced with constant acceleration and deceleration cycles. The automatic 9-speed transmission, while remarkably smooth and intelligent, works overtime in city driving to keep the strong V8 in its power delivery sweet spot, consuming more fuel in the process.

On the highway, the picture improves slightly, with the EPA rating it at 21 MPG. This is where the engineering prowess of the AMG GT 63 can stretch its legs a bit, settling into higher gears and cruising with surprising composure. The twin-turbo 4.0L V8, while potent, can exhibit a measure of restraint at steady speeds, allowing the transmission to keep engine RPMs low. Yet, even at highway speeds, the potential for blistering acceleration is always just a flex of the right foot away, and any sudden demand for power will quickly negate any efficiency gains. The vehicle’s aerodynamic profile is optimized for stability at high speeds, not for minimal drag at sedate ones, further contributing to its consumption figures.

Annual Fuel Cost

The EPA estimates the annual fuel cost for the 2025 Mercedes-Benz AMG GT 63 4matic Plus to be $3,400 per year. This figure is calculated based on an average driving distance of 15,000 miles per year, with a mix of 55% city and 45% highway driving, using national average fuel prices for premium gasoline. For buyers of this caliber of vehicle, this substantial annual expenditure is typically a non-factor. It’s simply one line item in the broader cost of ownership that includes higher insurance premiums, more expensive maintenance, and the initial purchase price itself. This $3,400 annual fuel cost is a direct reflection of the vehicle’s immense power and performance, and it is readily accepted as part of the price of admission to this exclusive club.

Real-world expectations

Real-world fuel economy for the AMG GT 63 4matic Plus often hovers around or even below the EPA estimates, particularly for drivers who regularly exploit its performance capabilities. These cars are bought to be driven hard, to revel in the surge of torque and the intoxicating engine note. Enthusiastic driving, frequent heavy acceleration, and sustained high-speed cruising will inevitably push the MPG figures into the lower teens, possibly even single digits during track excursions or extremely aggressive driving. Conversely, a driver with an exceptionally light foot, prioritizing smooth acceleration and gentle braking, might occasionally nudge slightly above the EPA highway rating. However, such a driving style is rarely the primary motivation for owning an AMG GT 63. This is a car that encourages, even demands, engagement, and that engagement comes at the pump. For more about Mercedes-Benz’s fleet, you can explore all Mercedes Benz fuel economy data on our site.

How it compares

When considering competitors, it’s important to remember that the AMG GT 63 4matic Plus occupies a potent niche, a luxurious four-door grand tourer with supercar-slaying performance. Its direct rivals similarly prioritize power over parsimony. The Porsche Panamera Turbo S, for example, with its 4.0L twin-turbo V8, delivers a comparable 14 MPG city, 20 MPG highway, and 16 MPG combined. The BMW M8 Gran Coupe, another close competitor packing a twin-turbo 4.4L V8, manages 15 MPG city, 20 MPG highway, and 17 MPG combined, virtually identical to the AMG. Even the Audi RS 7 Sportback, also with a 4.0L twin-turbo V8, comes in with 15 MPG city, 22 MPG highway, and 17 MPG combined.

These comparisons clearly illustrate that the AMG GT 63’s fuel economy is entirely in line with its segment. Buyers cross-shopping these vehicles are individuals who prioritize ultimate performance, brand prestige, advanced technology, and a thrilling driving experience above all else. They understand that a 600+ horsepower luxury sedan will inherently consume more fuel than a sensible family car. The slight variations in MPG among these rivals are unlikely to be a deciding factor; instead, it comes down to subjective preferences for driving dynamics, interior design, and brand loyalty. To see how other AMG models perform, check out AMG MPG across all years.

Tips to maximize efficiency

While optimizing fuel economy is unlikely to be a top priority for AMG GT 63 owners, there are still ways to slightly mitigate its thirst. Engaging the “Comfort” or “Slippery” driving modes, which soften throttle response and encourage earlier upshifts, can yield marginal improvements during relaxed cruising. These modes are designed to smooth out the power delivery, which inadvertently assists with more conservative fuel use.

Maintaining consistent highway speeds without aggressive acceleration or braking is another effective strategy. Using the adaptive cruise control can help keep the vehicle at a steady pace, preventing unnecessary speed fluctuations that demand more fuel. Smooth, deliberate inputs are always more efficient than sudden, jerky maneuvers.

Regularly checking and maintaining proper tire inflation is critical for any vehicle’s efficiency, and the AMG GT 63 is no exception. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Adhering to the manufacturer’s recommended pressures ensures optimal performance and efficiency.

Minimizing unnecessary weight in the vehicle can also play a small role. While the GT 63 is inherently heavy, avoiding carrying extraneous items in the trunk can marginally reduce the load on the engine, contributing to better fuel economy over time. Every pound matters, especially in a vehicle where performance is meticulously engineered.

Finally, planning routes to avoid heavy traffic and excessive idling will always conserve fuel. The AMG GT 63’s large engine will consume a considerable amount of fuel just sitting still, so minimizing time spent in gridlock can have a noticeable impact over the long run.