I have my P85D set to charge to 70% at 01:00am. Usually this gives me about 275 km (171 miles) in the morning. After not using the car for a day it was at only 270 km (167 miles). The next day at only 266 km (164 miles). The car was plugged in all the time. Why does the battery go down if the car is plugged in? Shouldn't it use the power from the outlet? Why does it not charge the battery back to 70% at 01:00 when it drops below during the day?