17 MPG combined is the first thing most people say about the 2020 Mercedes-Benz AMG GT 63 4matic Plus. Let’s be clear: nobody considering this high-performance sedan expects Prius-like efficiency. This is a four-door coupe with a hand-built 4.0L V8 bi-turbo engine, built to provide strong acceleration and a visceral sound, not to save fuel. It’s for wealthy drivers who value performance and exclusivity most. Practicality is a bonus.

City and highway performance

The EPA estimates for the AMG GT 63 are 15 MPG in the city and 20 MPG on the highway. The city figure reflects the demands of stop-and-go traffic, where the heavy curb weight and instant torque of the V8 cause fuel to burn at a faster rate. Highway driving, with consistent speeds and less frequent acceleration, allows for a small improvement, but the aerodynamic design of a four-door coupe isn’t ideal for fuel efficiency. The 9-speed automatic transmission does its best to keep the engine in its most efficient range, but the driver’s right foot controls how much gas is used.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Mercedes-Benz AMG GT 63 4matic Plus at $3,400. This is based on driving 15,000 miles per year and using national average fuel prices. Consider this a baseline, however. Drivers who accelerate more, or those in areas with higher fuel costs, will likely spend more. It’s a cost to pay for the performance and prestige this vehicle offers.

Real-world expectations

The EPA provides standardized testing, but real-world fuel economy can change significantly. Driving fast, something that goes along with vehicles like this, will lead to lower numbers. Expect the combined MPG to be closer to the lower end of the EPA range, or even lower, if you often use the engine’s full potential. On the other hand, drivers who accelerate slowly might get figures closer to the EPA estimates, especially on longer highway trips. But restraint is rarely why someone buys an AMG GT 63.

How it compares

The AMG GT 63’s fuel economy is similar to its rivals. The Porsche Panamera Turbo S E-Hybrid offers plug-in hybrid capability to increase efficiency in short distances, but delivers combined mpg numbers that are close. The BMW M8 Gran Coupe, also with a high-powered V8, offers similar MPG figures. All Mercedes Benz fuel economy data shows that high performance requires compromises. These comparisons matter for buyers considering similar vehicles, but the decision often comes down to brand, styling, and driving experience, factors that often outweigh a few MPG difference. AMG MPG across all years can provide more information for specific model comparisons.

Tips to maximize efficiency

The AMG GT 63 isn’t designed for hypermiling, but certain driving habits can help get more mileage from each gallon. Avoid accelerating quickly and braking hard. Smooth, gradual movements will reduce fuel consumption, even if it reduces the car’s potential.

Use the car’s driving modes carefully. Comfort mode softens the throttle and optimizes the transmission for efficiency, making it good for everyday commuting. Sport or Sport+ modes will increase fuel consumption.

Regular maintenance is important. Make sure the engine is properly tuned and that the tires are correctly inflated. A well-maintained engine and tires with the right pressure create less resistance, resulting in better fuel economy. Not doing these things can hurt fuel efficiency.

Let the engine idle as little as possible. Letting the engine idle for a long time wastes fuel. If you expect a long wait, turn off the engine. Modern vehicles warm up quickly while driving, so idling is often unnecessary.

Think about the route. Planning your trips to avoid traffic can save fuel. Stop-and-go traffic reduces fuel economy a lot. Choose routes with consistent speeds and fewer stops when possible.