The battery is 12 kWh in size, as on the 530e, and enables the Touring to travel electrically for up to 51 kilometres. In practice, 40 kilometres is certainly feasible.
If you put the 520e on the charger whenever possible, as we did during our test week, you can achieve an average combined consumption of 3.2 litres of petrol and 11.6 kWh of electricity per 100 km driven. The battery can be charged at 3.7 kW. It takes 3.6 hours to fully top it up from empty.
The silence on board and the relatively soft suspension make you feel relaxed in the spacious interior. Still, at 430 litres under the luggage cover, the boot is a lot smaller than that of the non-plug-in hybrid 5 Series Touring. Fortunately, you can retract the cover, making it quite practical nonetheless.