The manual says 1% per day and warns to be sure you have enough charge if you park at the airport. It says nothing about a deep sleep mode. I hope you are right.
Simply operating the handle should be sufficient. You should not need to actually open the door.
On another note, with the latest update, sometimes the car remembers that I was listening to the USB and resumes where I left off, and sometimes it forgets and I have to go all the way through the menus and select USB and pick an album and a track to start on. On the previous version is almost never remembered.
And another note, I've gotten into the habit of locking the door with the key card because I don't like walking away and hoping it actually locks. When I tried to lock the car from the passenger side, it did not lock. This happened on two separate occasions. I had to go around to the driver's side. Then I was able to lock it with the card. It can be unlocked from either side, but maybe it can be locked only from the driver's side?