Mercedes has added a third hybrid option to the S-Class range with this, the S500 Plug-In Hybrid. It follows the petrol-engined S400 and diesel-fuelled S300 BlueTEC hybrids.
As the name suggests, the new car is the only hybrid S-Class that can be recharged from a socket. Fully charging the 8.7kWh lithium-ion batteries takes around two hours at a typical three phase power point.
The S500 has an electricity-only range of around 20 miles before the 3.0-litre twin-turbo V6 petrol engine kicks in. By itself, the engine produces 328bhp, with the electric motor contributing 114bhp for a total of 442bhp and 479lb/ft of torque.
That’s enough for a 0-62mph time of 5.2 seconds and a limited top speed of 155mph. Even so, Mercedes claims faintly astonishing fuel economy of up to 100.9mpg and Co2 emissions of 65g/km.
That last number means the S500 Plug-In Hybrid is subject to a Benefit In Kind tax rate of just 5% on its £87,965 price, which could save company car buyers thousands of pounds a year. It’s Congestion Charge exempt and tax-free for private owners, too.
The S500 comes with some clever tech to maximise efficiency. It will “gently advise” the driver, sending a pulse through the throttle pedal to let them know it can be released to engage “sailing” mode and shut down the engine.
The Comand system looks ahead of where the car is travelling to predict where energy can be recuperated. It will even look to regenerate as much energy as possible before entering an urban area so it can run on electric power only.
The S500 Plug-In will only be available in top-spec long-wheelbase AMG Line trim, with 19-inch wheels, intelligent LED lights, the Comand Online infotainment system, noise insulating glass, leather upholstery and front memory seats.
The Mercedes S500 Plug-In Hybrid is on sale now. Given the massively reduced tax liability, it could be the S-Class of choice.
Visit the Mercedes website here