23 MPG combined isn’t going to win any hypermiling contests, but for the 2020 Mercedes-Benz S560e, it should be seen as an impressive figure. This is, after all, a plug-in hybrid version of the S-Class, a car known for luxury, advanced technology and a heavy curb weight. The S560e isn’t about thriftiness; it’s about delivering a quiet and opulent experience with a nod toward efficiency. Its buyers are typically captains of industry, executives, and individuals who value advanced engineering and lower fuel costs, but within a flagship sedan.

City and highway performance

The S560e’s efficiency splits into 21 MPG in the city and 26 MPG on the highway. The city figure reflects the benefits of the electric motor assisting the 3.0L inline-six. The electric motor does its best work in stop-and-go traffic or during light acceleration, significantly reducing the gasoline engine’s workload. On the open road, the 26 MPG highway figure represents the gasoline engine doing most of the work, though the electric motor can still provide a boost when overtaking. The 9-speed automatic transmission is key here, keeping the engine in its most efficient range at cruising speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 Mercedes-Benz S560e at $2,500. This figure is based on driving 15,000 miles per year and using national average fuel prices. Remember that your actual fuel costs will vary depending on your driving habits, the type of fuel you use, and local fuel prices. Drivers who frequently charge the vehicle and take advantage of its electric range could see significantly lower fuel costs, as the S560e is designed to cover short commutes and errands on electric power alone. However, those who primarily drive long distances without charging will rely more on the gasoline engine and could exceed the $2,500 estimate.

Real-world expectations

The EPA’s numbers provide a useful baseline, but real-world MPG for the 2020 S560e will depend on how you use the plug-in hybrid system. Drivers who diligently plug in and maximize electric range will see the best results, potentially exceeding the EPA combined MPG. Not charging the battery will result in fuel economy closer to a standard gasoline-powered luxury sedan. Keep in mind that driving style, traffic conditions, and even ambient temperature can impact fuel consumption. Aggressive acceleration, prolonged idling, and extreme temperatures can all reduce efficiency.

How it compares

Compared to its competitors, the S560e’s fuel economy paints an interesting picture. The Lexus LS 500h, another hybrid luxury sedan, achieves a combined 25 MPG, slightly better than the S560e. However, the S560e offers the added benefit of plug-in capability and the ability to drive solely on electric power for a limited range, something the LS 500h cannot offer. A non-hybrid BMW 740i xDrive, a direct competitor in the luxury sedan segment, gets only 24 MPG on the highway. For buyers prioritizing the plug-in capability and potential for electric-only driving, the S560e has an advantage. You can view S560E MPG across all years on FuelEconomyHub.com.

Tips to maximize efficiency

The most critical tip for maximizing fuel efficiency in the S560e is simple: plug it in. Regularly charging the battery and using the electric range for short trips and commutes will drastically reduce gasoline consumption. Use off-peak charging hours to save money on electricity costs and further minimize your carbon footprint.

Drive smoothly and anticipate traffic conditions. Avoid abrupt acceleration and braking, which consume more energy. Use the car’s Eco drive mode, which optimizes various systems to prioritize fuel efficiency. The S560e has significant power, so there is little need to push it hard most of the time.

Monitor your tire pressure. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended levels. This is especially important on a heavy vehicle like the S560e.

Reduce unnecessary weight. Carrying extra cargo in the trunk adds weight to the vehicle, which increases fuel consumption. Remove any unnecessary items from the car to improve efficiency. Remember, this is still an S-Class; it’s not designed to be a work truck.

Consider using the navigation system even on familiar routes. The S560e’s navigation system can analyze road conditions and provide the most fuel-efficient route. It might seem odd to use the navigation repeatedly, however, this car makes these decisions for you.

For more information browse all Mercedes Benz fuel economy data on FuelEconomyHub.com.