20 MPG combined is more a footnote than a headline when you’re considering the 2018 Mercedes-Benz AMG S63 4MATIC Coupe. To be clear, nobody shelling out six figures for a hand-built, twin-turbocharged V8-powered car is prioritizing fuel efficiency. This car is for those who want to experience breathtaking performance wrapped in opulent luxury, and the fuel bill is simply the price of admission.

City and highway performance

The EPA ratings break down to 17 MPG in the city and 27 MPG on the highway. The city figure is probably the more relevant one for many S63 Coupe owners. While capable of effortless cross-country cruising, these cars often spend their lives navigating urban landscapes, making power plays between stoplights, and serving as luxurious transportation to and from exclusive events. The highway figure is respectable given the car’s prodigious power and all-wheel-drive system, but it won’t win any hypermiling contests.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,900 for the 2018 AMG S63 Coupe. It’s worth understanding how this figure is derived: it assumes 15,000 miles of driving per year, with 55% of those miles driven in the city and 45% on the highway. It also presumes that the vehicle will be fueled with gasoline at the national average price. Of course, personal driving habits and fluctuations in fuel costs will impact the actual amount one spends at the pump. Drivers who accelerate quickly can expect significantly higher fuel bills.

Real-world expectations

Real-world MPG depends entirely on how you drive the S63 Coupe. Forget the EPA numbers. Treat it with respect and exercise restraint, and you might see figures close to the EPA estimates. However, the intoxicating rush of acceleration available at any moment is difficult to resist. Indulge frequently, and you’ll be staring at a much lower number on the trip computer. If you’re searching for all Mercedes Benz fuel economy data, this is not the place to find a frugal commuter.

How it compares

Compared to its segment rivals, the 2018 AMG S63 Coupe’s fuel economy is generally in line. The BMW M6 Coupe, with its 4.4L twin-turbo V8, posted similar numbers. A Porsche 911 Turbo S might offer a slightly better combined MPG due to its lighter weight and more efficient engine, but it lacks the sheer size and presence of the S63. Even looking at the less potent Mercedes Benz S560 Coupe, which offers similar luxury with a less aggressive engine, the MPG difference isn’t massive. Ultimately, buyers considering this class of vehicle are less concerned about squeezing every last mile from a gallon. The decision hinges more on brand preference, styling, and the specific driving experience offered. You can see AMG MPG across all years for other vehicles in the lineup.

Tips to maximize efficiency

While fuel economy might not be the priority, even owners of high-performance coupes can implement some strategies to reduce fuel consumption.

Take advantage of the S63’s various driving modes. “Comfort” mode softens throttle response and optimizes transmission settings for efficiency, whereas “Sport” and “Sport+” modes prioritize power delivery and hold gears longer, sacrificing fuel economy in the process. Using “Comfort” mode for routine commutes can make a noticeable difference.

Pay attention to tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Regularly check and maintain the recommended tire pressure to ensure optimal efficiency and handling.

Avoid excessive idling. Modern engines are designed to be efficient even at idle, but prolonged idling still burns fuel. If you’re going to be stopped for more than a minute or two, it’s best to turn off the engine.

Employ smooth acceleration and braking. Jackrabbit starts and hard braking waste fuel and put unnecessary strain on the car’s components. Anticipate traffic flow and maintain a steady speed whenever possible.