My parking garage doesn't have a charger. Therefore, when I know I'm going out of town for a while, I charge the car in advance. I set the cars power to off, to conserve more power. While out of town recently (for over 2 weeks), I checked the range remaining via the tesla app after 2 weeks, and found that it had lost 80 miles of range, while off! How is this possible, and what can I do in order to reduce this? It seems like a massive amount of battery usage for a car that is off.