18 MPG combined. That’s what you get with the 2015 Mercedes-Benz S63 AMG 4matic. This car isn’t about saving gas; it’s a hand-built example of luxury and incredible speed. Buyers aren’t comparing this to a Prius. They’re after a unique driving experience and making a statement and they know it will cost them at the pump.

City and highway performance

The S63 AMG’s EPA estimates are 15 MPG in the city and 23 MPG on the highway. The city number reflects urban driving, where the 5.5L twin-turbo V8 idles or crawls more than it accelerates. The highway number requires a light foot. If you accelerate hard, that 23 MPG will drop quickly. The 7-speed automatic transmission manages the engine’s power and tries to optimize fuel efficiency, but physics still apply.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2015 Mercedes-Benz S63 AMG 4matic is $3,200. This is based on driving 15,000 miles per year with a mix of city and highway driving and using premium gasoline. Changes in fuel prices will impact this cost. Drive more aggressively, or drive more than 15,000 miles annually, and expect that number to increase. This figure uses national average fuel prices, which may differ from your local rates.

Real-world expectations

Forget the EPA numbers in real-world conditions. While possible under ideal conditions (light acceleration and braking, empty highways, and cruise control), those conditions are rare for S63 AMG owners. A combined MPG figure closer to 16 or even 15 is more likely, especially in heavy traffic or with spirited driving. The AMG is tempting, and using all that power is fun. It’s a nearly 5,000-pound luxury sedan with enough horsepower to rival many sports cars. More performance means more fuel consumption.

How it compares

The S63 AMG’s fuel economy is similar to other high-performance luxury sedans. The BMW M5 delivers around 17 MPG combined in its comparable year. The Audi RS7 manages similar figures. Even the slightly smaller Mercedes-AMG E63 S, with its similar powertrain, only gains a small improvement. Choosing between these cars isn’t about one extra mile per gallon, it’s about performance, luxury, and prestige. The S63 AMG’s interior and presence often make it the favorite, even with more frequent gas station visits. For all Mercedes Benz fuel economy data, check out our dedicated section. And for more information specific to this model, you can review the S63 MPG across all years.

Tips to maximize efficiency

Even with its performance, you can get slightly better gas mileage from the S63 AMG. A smooth driving style is the best strategy. Avoid sudden acceleration and hard braking, which use a lot of fuel.

Carefully choose your driving modes. “Comfort” mode will reduce the throttle response and upshift earlier, saving fuel. Avoid using “Sport” or “Sport+” unless you’re on a racetrack, since they focus on performance.

Regular maintenance is important. Service your S63 AMG regularly, including oil changes, air filter replacements, and spark plug inspections. A well-maintained engine runs more efficiently and uses less fuel.

Keep tires inflated properly. Check tire pressures regularly and keep them at the recommended levels. Underinflated tires increase rolling resistance, which hurts fuel economy. Correct tire pressure helps with running more efficiently.

Don’t idle unnecessarily. Idling uses fuel without moving. If you’re waiting for more than a minute or two, turn off the engine. This simple habit can save fuel over time, especially in city driving.