The 2015 Mercedes-Benz S550e, with its 26 MPG combined rating, isn’t about chasing hypermiling records, it’s about delivering opulent comfort and cutting-edge technology with a hint of lower fuel costs. Think of it as a guilt-free indulgence for those who demand the absolute best without completely dismissing the realities of fuel consumption.

City and highway performance

The S550e uses its hybrid powertrain to achieve 24 MPG in the city. This is where the electric motor shines, providing instant torque and reducing the reliance on the gasoline engine during stop-and-go traffic. On the highway, the figure climbs to 30 MPG, showcasing the efficiency of the 3.0L turbocharged V6 when cruising at steady speeds. This duality allows owners to navigate urban environments with surprising frugality while still enjoying effortless long-distance travel.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 Mercedes-Benz S550e at $2,250. This figure is based on driving 15,000 miles per year, with an equal mix of city and highway driving, and using the national average fuel price at the time of testing. While this is a significant sum, it’s important to consider the price point and target demographic of the S550e. Owners are typically less sensitive to fuel costs compared to buyers of more mainstream vehicles and are sometimes willing to pay extra for the luxury and technology offered, especially with the added benefit of a plug-in hybrid electric vehicle.

Real-world expectations

As with any vehicle, real-world fuel economy can vary significantly depending on driving habits, traffic conditions, and climate. S550e owners who prioritize electric driving and frequently charge the battery can expect to see even better fuel economy figures, especially during shorter trips. However, those who primarily rely on the gasoline engine or frequently engage in spirited driving will likely experience lower MPGs. The key to maximizing fuel efficiency is understanding the hybrid system and adapting driving habits accordingly. It is also worth remembering that colder weather will reduce the range and efficiency of the battery.

How it compares

When compared to its rivals, the S550e occupied a unique space in its class. The non-hybrid S550 of the same year, with its V8 engine, achieves only 20 MPG combined. The BMW 740e xDrive iPerformance, another plug-in hybrid competitor from the same era, offers similar fuel economy numbers at around 27 MPG combined. However, vehicles like the Audi A8, without hybrid powertrains, typically achieve around 22 MPG combined. This comparison shows the advantage of the S550e’s hybrid system for those seeking a degree of fuel efficiency in a flagship sedan. For more information, review all Mercedes Benz fuel economy data. You can also see S550E MPG across all years.

Tips to maximize efficiency

Prioritize electric driving whenever possible. The S550e’s electric motor provides ample power for most city driving situations. Regularly charging the battery will allow you to take full advantage of the electric range and significantly reduce gasoline consumption. Try to precondition the vehicles temperature when plugged in to maximize range.

Use the “ECO” driving mode. This mode optimizes the powertrain for fuel efficiency by reducing throttle response and adjusting shift points. While it may slightly impact performance, it can make a noticeable difference in overall fuel consumption, especially during highway driving.

Practice smooth acceleration and braking. Avoid sudden bursts of acceleration or hard braking, as these actions waste energy. Instead, accelerate gradually and anticipate traffic conditions to allow for smooth, regenerative braking, which helps recharge the battery.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended level, which is typically found on a sticker inside the driver’s side doorjamb.

Minimize unnecessary weight. Carrying excessive weight in the vehicle reduces fuel economy. Remove any unnecessary items from the trunk and passenger compartment to lighten the load and improve efficiency.