21 MPG combined is not a headline figure for the 2018 Mercedes-Benz S560 4matic, nor should it be. This is a flagship sedan, a technological marvel draped in supple leather and powered by a twin-turbo V8. Its buyers prioritize effortless performance and unparalleled comfort over squeezing every last mile from a gallon of premium unleaded. They accept the fuel economy realities inherent in owning a nearly 4,700-pound luxury car, understanding it is a trade-off for the experience it delivers.

City and highway performance

The EPA estimates of 17 MPG in the city and 27 MPG on the highway reflect the demands placed on the S560’s 4.0L V8. Urban driving, with its constant stop-and-go, keeps the turbos spooled and the engine working, resulting in lower fuel efficiency. The advanced 9-speed automatic transmission does its best to mitigate this, selecting the optimal gear for every situation, but physics ultimately prevail. Out on the open road, the S560’s long gearing and aerodynamic profile allow it to cruise comfortably and efficiently, approaching the 27 MPG highway estimate with relative ease. However, aggressive acceleration will inevitably penalize fuel consumption, even at steady speeds.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2018 Mercedes-Benz S560 4matic is $2,750. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway. The EPA also relies on national average fuel prices to calculate this estimate. Keep in mind that this is just an estimate; your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and local fuel prices. Someone who drives predominantly in stop-and-go city traffic will likely exceed this figure, while someone who does primarily highway driving might see slightly lower costs. You can compare this to S560 MPG across all years.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy for the S560 4matic can vary significantly. Expect to see figures close to the EPA’s city estimate during your daily commute, particularly if it involves heavy traffic. On longer trips, however, achieving or even exceeding the 27 MPG highway estimate is certainly possible, provided you maintain a reasonable speed and avoid aggressive acceleration. Remember that using the vehicle’s performance features, such as Sport mode, will dramatically reduce fuel economy. The weight of passengers and cargo also impacts real-world MPG.

How it compares

The 2018 Mercedes-Benz S560 4matic’s fuel economy aligns with other similarly powerful luxury sedans. The BMW 750i xDrive, with its 4.4L twin-turbo V8, achieves an EPA-estimated 17 MPG city, 25 MPG highway. The Audi A8 L 4.0T, featuring a comparable 4.0L twin-turbo V8, manages 19 MPG city and 29 MPG highway. The Lexus LS 500, with its 3.5L twin-turbo V6, offers better fuel economy at 19 MPG city and 30 MPG highway, a trade-off for slightly less raw power. These comparisons matter to the S560 buyer, who wants to ensure they are not sacrificing significantly on fuel efficiency without justification. For further information, take a look at all Mercedes Benz fuel economy data.

Tips to maximize efficiency

Gentle acceleration and braking are key to maximizing fuel economy in the S560. Avoid aggressive starts and hard braking, which put unnecessary strain on the engine and waste fuel. Anticipate traffic flow and allow the car to coast whenever possible, using the regenerative braking system to recapture energy.

Proper tire inflation plays an important role in fuel efficiency. Check your tire pressure regularly and maintain the recommended inflation levels, which can be found on a sticker inside the driver’s side doorjamb or in the owner’s manual. Underinflated tires increase rolling resistance and reduce fuel economy.

Reduce unnecessary weight in the vehicle. Extra weight puts a strain on the engine and reduces fuel economy. Remove any items that are not essential, such as golf clubs, heavy tools, or unnecessary personal belongings.

Minimize idling time. Idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, turn off the engine. The S560’s start-stop system automatically shuts off the engine at traffic lights and restarts it when you release the brake pedal, conserving fuel.

Consider using the “Comfort” driving mode whenever possible. This mode optimizes the engine and transmission settings for fuel efficiency, while still providing a smooth and comfortable driving experience. Avoid using “Sport” or “Sport+” modes unless you specifically need the extra performance.

Understanding the 2018 S560 4matic’s fuel economy is about appreciating its purpose. It delivers a level of performance and luxury that demands a certain fuel consumption. It is a powerful and technically advanced machine, and its owners are willing to accept the trade-off.