15 MPG combined in the 202 5 Mercedes-Benz AMG G63 is a confident declaration. This figure is not a point of contention for its buyers, but rather a characteristic of a vehicle that prioritizes monumental performance, unyielding presence, and a singular driving experience above all else. The G63 exists outside the typical SUV paradigm, a squared-off titan built to dominate both the urban jungle and the occasional untamed path, delivering its intoxicating V8 symphony and relentless acceleration with an unapologetic thirst for premium octane. The individual who finds themselves behind the wheel of a G63 isn’t merely looking for transport; they are seeking an indulgence, a statement, and a machine that understands the intrinsic value of raw power.

City and highway performance

The EPA estimates for this 15 MPG combined figure are 14 MPG in the city and 16 MPG on the highway. This marginal difference between city and highway figures is characteristic of the AMG G63’s powertrain and aerodynamic profile. In stop-and-go city driving, the 4.0L twin-turbo V8, with its 577 horsepower and 627 lb-ft of torque, is constantly working to move its substantial mass off the line, engaging its 9-speed automatic transmission through frequent shifts. The exhilaration of its instantaneous acceleration and the glorious rumble at every blip of the throttle are direct contributors to its urban consumption. On the highway, while the engine can settle into higher gears, the G63’s iconic, bluff frontal area acts as a formidable air brake, requiring significant power to maintain cruising speeds against wind resistance. This is not a vehicle sculpted for aerodynamic efficiency; it is engineered for presence and capability, and its fuel economy figures reflect that uncompromising design.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,850 for the 2025 Mercedes-Benz AMG G63. This precise figure is derived from a standard calculation assuming 15,000 miles driven per year with a 45% city and 55% highway driving mix, using national average fuel prices, and factoring in the vehicle’s combined 15 MPG rating. For the typical G63 owner, this expenditure is simply a line item commensurate with the vehicle’s purchase price and ongoing maintenance. It’s an expected cost of entry for piloting a luxury high-performance SUV with such prodigious power and substantial presence. Those who invest in a G63 understand that its exceptional capabilities come with a corresponding operational cost, and for them, the experience delivered far outweighs the fuel expense.

Real-world expectations

In real-world driving scenarios, owners of the AMG G63 can expect its fuel economy to hover around the EPA estimates, sometimes dipping lower depending on driving style. The temptation to exploit the twin-turbo V8’s immense power is difficult to resist. Frequent, heavy throttle inputs, which are practically invited by the G63’s dynamic character, will predictably result in figures closer to the 14 MPG city estimate, or even below. Spirited driving, perhaps winding through canyon roads or executing quick overtakes, will see the fuel gauge drop with satisfying immediacy. Conversely, a disciplined driver maintaining consistent highway speeds with minimal acceleration could potentially nudge closer to, or even slightly exceed, the 16 MPG highway figure, though this requires a level of restraint that many G63 owners might find antithetical to the vehicle’s very essence. The G63’s mission is to excite, and that excitement often comes at the expense of maximum efficiency.

How it compares

When stacked against its high-performance luxury SUV peers, the 2025 AMG G63’s 15 MPG combined positions it squarely within the expected range for its segment, a segment defined by power and prestige over miserly consumption. The Porsche Cayenne Turbo E-Hybrid, for instance, offers a significantly better 46 MPGe combined but requires plug-in charging to achieve its electric range, and its pure gasoline figure is closer to 20 MPG combined. The Lamborghini Urus Performante, another direct competitor focused on high-octane thrills, delivers a similar 14 MPG combined. Even the Land Rover Range Rover SV with its 4.4L Twin Turbo V8 comes in at a slightly better 18 MPG combined, but with less outright horsepower. For customers seeking all Mercedes Benz fuel economy data, the G63 makes no apologies for its consumption relative to its peers. Its unique blend of off-road credibility, opulent luxury, and unadulterated AMG performance establishes its own benchmark. This particular buyer isn’t cross-shopping based on fuel economy; they’re discerning the nuances of raw power, exclusivity, and the distinct aura only a AMG MPG across all years G-Wagen can provide.

Tips to maximize efficiency

While the AMG G63 isn’t about hypermiling, subtle adjustments can provide incremental improvements to its fuel economy. Employing a smoother driving style, characterized by gentle acceleration and anticipating traffic to avoid abrupt braking, will reduce the engine’s workload and improve overall efficiency, particularly in urban settings. This allows the powertrain to operate within its most efficient RPM bands more consistently.

Regular maintenance is crucial. Adhering to the factory-recommended service schedule ensures the 4.0L V8 and 9-speed transmission operate at peak efficiency. Clean air filters, properly inflated tires, and fresh engine oil all contribute to reducing resistance and optimizing combustion within the powerful engine.

Consider the use of “Comfort” mode in the AMG DYNAMIC SELECT system. While the allure of “Sport+” is strong, “Comfort” mode adjusts throttle response, transmission shift points, and suspension settings for a more relaxed and, consequently, more fuel-efficient driving experience. This mode allows the engine to upshift earlier and linger in higher gears, reducing fuel consumption.

Minimizing unnecessary weight in the vehicle also plays a small role. While the G63 is inherently heavy, removing any extraneous items from the cargo area means less mass for the V8 to propel. Even seemingly minor reductions contribute to the overall effort required of the engine.

Finally, avoid prolonged idling. If parked for more than a minute, turning off the engine consumes less fuel than letting it idle, especially with an engine of this displacement. The G63’s start/stop system can assist with this, but drivers can also manually cut the engine when stopped for extended periods.