I left my car parked without charging for a week and I loose less that 3%. I did the following:
- Sentrry Mode off
- Alarm off
- Summon off (from the Auto Pilot submenu)
- Set Max Speed to 50 miles.
- Set Valet Mode.
- Set Pin to Drive
There are several YouTube videos dealing with
leaving a Model Parked for a week (you can jump at 5:00)