26 MPG combined in the 2017 Mercedes-Benz S550e isn’t going to win any hypermiling competitions, but it offers a blend of luxury, performance, and efficiency for a plug-in hybrid limousine. This vehicle isn’t primarily about saving money at the pump; it’s about technological advancement and a subtle nod towards lower fuel costs, all while enjoying the ride quality and opulence that an S-Class provides.

City and highway performance

The EPA estimates suggest 24 MPG in the city and 30 MPG on the highway. These figures reveal more about the S550e’s character. The city MPG shows the benefits of the electric motor, which allows for emissions-free cruising at lower speeds and helps offset the fuel consumption of the 3.0L V6. The highway figure, while higher, indicates that the gasoline engine is doing more of the work at consistent cruising speeds. Buyers in urban environments who frequently encounter stop-and-go traffic will likely see figures closer to that 24 MPG mark, if not slightly better with diligent charging, while those who primarily use the S550e for longer highway trips can expect performance mirroring the EPA estimate.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2017 Mercedes-Benz S550e is $2,250. This figure is based on driving 15,000 miles per year and using national average fuel prices. It’s important to remember that this is an estimate, and your actual fuel costs will vary depending on your driving habits, the percentage of electric-only driving you do, how often you charge the battery, and the prevailing fuel prices in your area. However, the $2,250 figure provides a standardized benchmark against which to compare the S550e’s operating costs with other vehicles in its class.

Real-world expectations

The S550e owner isn’t solely focused on squeezing every last mile from a gallon of gasoline. They appreciate the smooth, almost quiet operation in electric mode around town. They also understand that the S550e’s real-world mileage is highly dependent on how frequently they plug it in. Infrequent charging will negate the benefits of the hybrid system, resulting in fuel economy that more closely resembles a conventional luxury sedan. Charging often, embracing the EV range, and using regenerative braking features will be essential for maximizing efficiency and realizing the S550e’s fuel-saving potential. Reviewing S550E MPG across all years can provide further insights into owner-reported figures and trends.

How it compares

Compared to its rivals, the 2017 S550e was unique. Direct competitors like the BMW 740e xDrive (rated at 64 MPGe combined, but significantly lower on gasoline only) also appealed to buyers with plug-in hybrid technology. However, the S550e traded some EV range and raw MPG for a distinctly Mercedes-Benz driving experience. Traditional gasoline-powered competitors like the S550 (around 20 MPG combined) consumed considerably more fuel, while diesel options like the older S350d (discontinued in the US before 2017) offered better fuel economy but lacked the electric driving range and tax incentives associated with the S550e. Therefore, choosing the S550e indicates a preference for a specific blend of efficiency, luxury, and advanced technology, even if other options exist with slightly superior fuel economy numbers.

Those seeking all Mercedes Benz fuel economy data can find resources online.

Tips to maximize efficiency

Use the available driving modes to optimize fuel consumption. Select “Electric” mode for city driving whenever possible, prioritizing the electric motor for emissions-free operation and minimizing gasoline use in stop-and-go traffic. Switch to “Hybrid” mode for highway driving, allowing the system to intelligently manage the electric motor and gasoline engine for optimal efficiency. Using the “Charge” mode sparingly on long journeys can also help to top off the battery for increased electric range when you reach urban areas.

Employ the regenerative braking system effectively. Anticipate stops and coast whenever possible, allowing the regenerative braking to recapture energy and recharge the battery. Avoid hard braking, as this reduces the amount of energy recuperated. Regenerative braking conserves fuel and extends the life of your brake pads.

Ensure that the tires are properly inflated. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check your tire pressure regularly and inflate them to the recommended level found on the doorjamb sticker. Correct tire pressure also contributes to better handling and tire longevity.

Minimize unnecessary weight in the vehicle. Excess weight forces the engine to work harder, resulting in increased fuel consumption. Remove any unnecessary items from the trunk and passenger compartment, and avoid carrying heavy loads whenever possible. Every pound saved translates to a slight improvement in efficiency.