PHEV in winter, what remains of the capacity?

Now it’s really cold the first days, the snow came down and the available kilometers in purely electric mode. How far do you get with 24 °C on the heater and Poppowarmer? I turn on the heater, the range goes down 5 km. Discs de-iron are the next 2-3 km range away. And then there is the fact that, despite the indicated residual range of 12 km, the petrol engine starts. In summer easy 46-49 km of manchma I also 50-51 km. Now I am glad to come over the week (7 km a day back and forth). What are your experiences?