18 MPG combined isn’t great for many car buyers, but it comes with the 2021 Mercedes-Benz AMG GT 63 S 4matic Plus. This isn’t a car for sensible commuting or maximizing fuel savings. It’s a four-door coupe made for blistering performance and head-turning style, and its fuel economy shows that. The buyers who sign for this car understand exactly what they’re getting: a hand-built, twin-turbocharged V8 experience, not a Prius.

City and highway performance

The EPA estimates the AMG GT 63 S 4matic Plus at 16 MPG in the city and 21 MPG on the highway. The difference between these numbers shows the car’s true character. In stop-and-go city driving, the heavy curb weight and the potent, thirsty V8 engine are factors. Fuel consumption jumps as the engine works harder to overcome inertia and navigate urban congestion. However, on the open highway, where the advanced 9-speed automatic transmission can shift into higher gears and the engine maintains a more relaxed pace, the fuel efficiency improves, though it’s still hardly economical. Achieving 21 MPG requires a light gas pedal and a steady cruise, avoiding the temptation to use the car’s power.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2021 Mercedes-Benz AMG GT 63 S 4matic Plus at $3,200. This figure is based on driving 15,000 miles per year, with a percentage of those miles driven in the city compared to the highway, and using national average fuel prices. It provides a standard to compare the fuel expenses of different vehicles. Keep in mind this number can change depending on individual driving habits, local fuel prices, and the type of fuel used. The GT 63 S requires premium fuel, which increases the cost per gallon. For drivers who frequently accelerate aggressively or spend most of their time in heavy traffic, the actual annual fuel cost will likely exceed the EPA estimate. Owners should also consult all Mercedes Benz fuel economy data to compare across the product line.

Real-world expectations

While the EPA figures are a useful reference, real-world fuel economy for the AMG GT 63 S is often lower. The car’s performance capabilities are too tempting for many owners, leading to bursts of acceleration and spirited driving. The car invites aggressive use; its throaty exhaust and seemingly limitless power delivery encourages drivers to push the limits, sacrificing fuel efficiency for the thrill. Owners should expect to average closer to the city MPG figure of 16 MPG in mixed driving conditions, especially if they live in urban areas or frequently deal with traffic. The harder you drive, the more fuel you will burn, which is true with a high-performance vehicle like this.

How it compares

Compared to other high-performance luxury vehicles, the AMG GT 63 S’s fuel economy is similar to its competitors. The Porsche Panamera Turbo S E-Hybrid is rated at 19 MPG combined, offering a slight advantage because of its hybrid powertrain, but with a higher price. The BMW M8 Gran Coupe achieves around 17 MPG combined, putting it in a similar range. The Audi RS 7, despite its slightly less aggressive styling, hovers around 18 MPG combined. The differences in MPG rarely sway buyers in this vehicle class since performance, styling, exclusivity and brand reputation are more important. For more context, you can review AMG MPG across all years.

Tips to Maximize Efficiency

Avoid aggressive acceleration and braking. The AMG GT 63 S 4matic Plus responds quickly to throttle input, making it easy to burn extra fuel. Gentle acceleration and anticipatory braking can improve fuel efficiency, especially in city driving. Smooth driving is more efficient.

Use the car’s driving modes carefully. The AMG GT 63 S offers driving modes, including Comfort, Sport, and Sport+. While Sport and Sport+ enhance throttle response and shift patterns for performance, they also increase fuel consumption. Select Comfort mode for everyday driving to optimize fuel efficiency without sacrificing too much driving experience.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure and inflate them to the recommended levels on the doorjamb sticker. This maintenance step can have a noticeable impact on fuel economy.

Reduce unnecessary weight. Carrying excessive weight in the trunk or passenger compartment can negatively impact fuel efficiency. Remove unnecessary items to lighten the load and improve performance since this even applies to the fuel tank, avoid driving around with a perpetually full tank unless you are planning a long journey to save on weight.