The Mercedes-Benz S500 Plug-in Hybrid offers s omething for nothing – in theory. As well as being the latest addition to the S-class range, it looks like a bit of a no-brainer for the chauffeurs and fleet drivers that make up the majority of the car’s customer base. The list price of the car may be £90k. These days, all it takes is a 3.0-liter V-6 and an electric motor to comfortably exceed 400 horsepower in the form of the 436-hp Mercedes-Benz S550 plug-in hybrid. Save $46,793 on a 2015 Mercedes-Benz S-Class Hybrid Plug-in S 550 near you. Search over 8,100 listings to find the best local deals. We analyze millions of used cars daily. The 2015 Mercedes-Benz S500 plug-in hybrid is the most efficient S-class yet, and Benz will show it off at this year's Frankfurt auto show. Read more and see photos at Car and Driver. 2015 Mercedes-Benz S500 Plug-In Hybrid The Mercedes-Benz S500 Plug-In Hybrid offers a system output of 325 kW and 650 Nm torque, sprints from 0 to 100 km/h in just 5.2 seconds and can drive up to 33 km purely electrically. The certified consumption is 2.8 litres/100 km, which corresponds to 65 g CO2/km emissions.