Today i visited more locations. My first appointment at 29km from my home. I extended pre-heating (connected to the charger) to 20 minutes because monday some ice was left on my windows after 10 minutes pre-heating. The disadvantage is that the battery looses some capacity because heating takes a little more power than the charger can deliver. I started with 33.8Ah in the battery and without pre-heating this is usually 36Ah. The boardcomputer showed a range of 40km with 5km left after 29km driving. Outside temperature around 0 degrees Celcius and i did not use the heating, except for the heated seat.
The car was almost fully charged (34Ah) 3½ hours later for 10km drive to my next location. I did not charge anymore for the following trip of 31km With the heating on this time leading to only 62.9% EV drive and using 1.2L of gasoline.
I had to pick up something and then the last 3km fully electrical to my home. I used 13.7 kWh and 1.2L gas for 72km. Total cost about 5.50€ and almost 90% electrical.