With an unladen weight of 1,880 kg, the C 300 de Estate is 340 kg heavier than the C 220 d Estate with which it shares its diesel engine. The cause is the 13.5 kWh battery which was installed under and behind the back seat. Rather annoyingly, this battery eats into the volume of the boot. A capacity of 315 litres is anything but generous, as the battery takes up 145 litres in the form of a bulky bar.
While Mercedes promises an electric range of 50 kilometres, we got no further than 35. This is sufficient for most journeys and those electric miles are also very pleasant because the C-Class excels at pampering its passengers with comfort and silence.