18 MPG combined isn’t going to win any awards for less gas, but that’s not the goal of the 2021 Mercedes-Benz AMG GT 63 4matic Plus. This is a four-door coupe with handcrafted power and carefully engineered performance. People who buy this car are prioritizing thrills, luxurious features, and the prestige of the AMG badge. Fuel economy is a secondary consideration, more of an inconvenience than a deciding factor.

City and highway performance

The EPA estimates 16 MPG in the city and 21 MPG on the highway for the AMG GT 63 4matic Plus. The city number reflects urban driving’s stop-and-go nature, where the car’s strong 4.0L V8 is mostly untapped and spends more time idling. The highway number is more agreeable, suggesting that longer cruises at steady speeds allow for some efficiency, but still far from frugal. But even on the open road, the temptation to unleash the V8 and experience its quick acceleration will quickly lower that number.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for the 2021 Mercedes-Benz AMG GT 63 4matic Plus. This is based on driving 15,000 miles per year and using national average fuel prices. This is just an estimate; your actual fuel costs will vary depending on your driving habits, the type of fuel you use (premium is recommended), and where you live, as fuel prices can vary significantly across different states.

Real-world expectations

Expect to see numbers lower than the EPA estimates in real-world driving, especially if you frequently use the engine’s potential. Fast acceleration, frequent short trips during which the engine doesn’t fully warm up, and the sound of the AMG exhaust all decrease fuel economy. Owners who are heavy-footed, or who spend most of their time in dense urban environments, could see numbers in the low teens. Those who are more disciplined and primarily drive on the highway might get close to the EPA numbers, but exceeding them will be a challenge. Browse AMG MPG across all years to see how earlier models have fared.

How it compares

Compared to other high-performance luxury sedans and coupes, the AMG GT 63 sits in the expected range. The Porsche Panamera Turbo S, another strong four-door coupe, achieves similar numbers in real-world driving, with an EPA-estimated 18 MPG combined. The BMW M8 Gran Coupe, with its own twin-turbo V8, manages slightly better, achieving a combined 17 MPG, primarily due to its marginally superior highway rating. Even the Audi RS7, known for its blend of style and performance, comes in at 18 MPG combined. For this class of vehicle, fuel economy differences are minimal and rarely a primary decision-making factor. You can also view all Mercedes Benz fuel economy data.

Tips to maximize efficiency

While fuel efficiency isn’t the AMG GT 63’s strength, there are still actions you can take to minimize fuel consumption. Use the car’s drive mode selector to choose a more economical setting, such as Comfort or Eco mode. These modes will reduce throttle response, encourage earlier upshifts, and generally make the car less eager to burn fuel.

Resist the urge to constantly accelerate hard. Smooth, gradual acceleration is more fuel-efficient than repeatedly stomping on the gas pedal. This is important in city driving, where frequent starts and stops can quickly drain the fuel tank.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended levels specified in the owner’s manual or on the doorjamb sticker.

Minimize idling. If you anticipate stopping for more than a minute or two, turn off the engine. Idling burns fuel without moving the car, and it’s wasteful in a high-performance vehicle like the AMG GT 63.

Service you vehicle regularly. Ensuring that your vehicle is properly maintained will help keep it operating efficiently. Faulty or worn components can cause a reduction in mile per gallon.