14 MPG combined for the 2025 Mercedes-Benz AMG GT 55 4MATIC+ Coupe is not just a number; it defines what the car is about. This 4.0L twin-turbocharged V8 engine, with its engineering, prioritizes visceral performance above all else. This is a grand touring machine designed to travel at high speeds, not to save fuel. Its purpose is to deliver a blend of power, precision, and luxury, making a modest fuel economy figure an undeniable, and for its target audience, entirely acceptable, byproduct of its capabilities.

City and highway performance

The EPA figures show a 12 MPG city rating and 19 MPG on the highway for the AMG GT 55 Coupe. The city figure, low for a 4.0L 8-cylinder engine paired with a 9-speed automatic transmission and full-time all-wheel drive, reflects the constant stop-and-go driving, the frequent accelerations needed to use its power, and the sheer inertia of moving a high-performance luxury coupe through urban environments. Highway driving, where the engine operates in its most efficient RPM range and the 9-speed automatic can use its taller gears, sees a noticeable improvement. Here, the AMG GT 55 can settle into a long-legged stride, although drivers are rarely content to simply cruise. This vehicle begs to be unleashed, and even on the open road, the temptation to dip into its immense torque reserves will invariably impact those 19 MPG aspirations.

Annual fuel cost

The EPA estimates an annual fuel cost of $4,150 for the 2025 Mercedes-Benz AMG GT 55 4MATIC+ Coupe. This figure is calculated based on an assumption of 15,000 miles driven per year, split between city and highway driving, and using national average fuel prices, which for a premium, high-performance vehicle like this, would typically mean premium octane. For the buyer of an AMG GT 55, this $4,150 commitment is a small detail in the overall cost of ownership. It’s an accepted expense, dwarfed by depreciation, insurance, and the initial purchase price. This owner isn’t cross-shopping based on fuel economy; they’re investing in an experience, and the cost of the fuel that powers that experience is simply part of the package. This shows that performance, not saving money, is the driving force behind this vehicle’s appeal.

Real-world expectations

In real-world driving, especially for the enthusiast who truly uses the AMG GT 55’s capabilities, expect MPG figures to hover closer to the city estimate, or even below it, particularly if track days or spirited canyon carving are in the cards. The potent 4.0L V8 and its accompanying turbochargers are designed for immediate, relentless power delivery, and extracting that power burns fuel. A heavy right foot, frequent bursts of acceleration, and aggressive driving modes will quickly see those 14 MPG combined figures plummet. Conversely, a disciplined driver on a long, steady highway cruise might occasionally nudge past the 19 MPG highway rating, but such restraint often feels contradictory to the very nature of an AMG GT. The reality is that the joy this vehicle delivers comes at a cost, and that cost includes a healthy appetite for premium fuel.

How it compares

Comparing the AMG GT 55’s fuel economy shows its position as a dedicated performance machine. A direct rival like the Porsche 911 Carrera S, with its 3.0L twin-turbo flat-six, often achieves around 20 MPG combined (18 city/24 highway), offering a notable advantage in efficiency. The Aston Martin Vantage, another V8-powered competitor using a variant of the same engine as the AMG GT, typically sees similar figures to the AMG GT 55, around 18 MPG combined (16 city/21 highway), showing the inherent efficiency challenges of high-output V8s. Even the BMW M8 Competition Gran Coupe, a four-door performance coupe, manages a slightly better 17 MPG combined (15 city/22 highway) from its twin-turbo V8. The buyer of the AMG GT 55 isn’t primarily cross-shopping for MPG; they’re buying a specific blend of luxurious grand touring and unadulterated AMG performance. The slightly lower figures compared to some rivals are accepted as part of AMG’s more aggressive tuning philosophy and the sheer power on tap, though shoppers can review all Mercedes Benz fuel economy data for the full picture.

Tips to maximize efficiency

While the AMG GT 55 is inherently thirsty, adopting a smoother driving style can noticeably impact its fuel consumption. Gentle throttle inputs, anticipating traffic flow, and avoiding abrupt acceleration and braking minimize the demands on the powerful 4.0L engine and its twin turbos.

Use the vehicle’s various driving modes intentionally. While Sport+ and Race modes unlock maximum performance, they also optimize engine mapping and transmission shift points for aggressive driving, inherently increasing fuel burn. Comfort or Slippery modes will prioritize smoother shifts and earlier upshifts, helping to conserve fuel.

Maintain consistent highway speeds and engage the adaptive cruise control when appropriate. The vehicle’s electronic systems can often manage throttle input more smoothly and consistently than a human foot, preventing unnecessary speed fluctuations that increase fuel consumption.

Ensuring proper tire inflation is a simple yet effective way to improve efficiency in any vehicle, including the AMG GT 55. Underinflated tires increase rolling resistance, forcing the engine to work harder. Regularly checking and adjusting tire pressures to the manufacturer’s recommendations pays dividends.

Keeping up with the prescribed maintenance schedule, particularly oil changes, air filter replacements, and spark plug inspections, ensures the 4.0L V8 operates at its peak efficiency. A well-maintained engine runs smoother and more effectively, reducing unnecessary fuel consumption. Drivers interested in how AMG performance affects efficiency can explore AMG MPG across all years.