Mercedes S-Class hybrid range, MPG, CO2 & charging

The Mercedes S-Class hybrid promises 25 miles of electric range, and up to 128.4mpg fuel economy

Fuel economy CO2 emissions Electric range Wallbox charge time
104.6-128.4mpg 57g/km 25 miles 1 hr 30 mins

The Mercedes S-Class plug-in hybrid promises fuel economy that its petrol and diesel siblings can’t match, although you pay a sizeable premium for the privilege. Fortunately, PHEV technology suits the comfortable, luxurious approach of the S-Class; something that can’t be said for many other plug-in vehicles.

Mercedes S-Class hybrid range, MPG & CO2 emissions

The Mercedes S-Class features a 13.5kWh battery, which the carmaker claims will return up to 25 miles of pure-electric range on a single charge. For city dwellers and those with short commutes, this will be enough for low-cost electric running most of the time, although PHEVs with better electric range are available elsewhere.

Officially, the S-Class returns between 104.6 and 128.4mpg, figures which have been derived from the latest WLTP efficiency test. Naturally, you’ll need to keep the battery topped up regularly to see anything like those numbers, but doing so will see the 3.0-litre petrol engine left unused during shorter trips.

Official CO2 emissions are also suitably low, with the S-Class emitting 57g/km on paper. This is enough to earn exemption from the London Congestion Charge zone, potentially saving owners £11.50 per day in the capital from Monday to Friday.

However, bear in mind that only vehicles that are entirely zero-emissions will qualify for exemption after October 2021. After that date, plug-in hybrids like the S-Class will need to pay the daily charge.

Charge time

Mercedes says the S-Class will charge fully from a domestic three-pin socket in five hours, with a 7.2kW home wallbox charger cutting that figure to 90 minutes.

In our experience, a wallbox charge time of around two hours is more realistic for the 13.5kWh battery in the S-Class plug-in hybrid, although we’ve yet to put Mercedes’ hour-and-a-half charging claim to the test ourselves.

A set of eight-metre-long charging cables are included with the car.