That works out to 8 mi/day, which is comparable to 4.5. Loss over 12-13 hours should be 1-2 miles.
That's certainly closer to my experience. I didn't get 5.8 until a service center visit to replace a 12v battery a week ago, and the difference has been dramatic. I would routinely lose 10mi of range a day when parked on 4.5, but I've been experimenting while at home for the holidays. I haven't driven the car in three days, and have only lost 7 miles of range! That's a pretty amazing improvement, doubly so given that I've woken the car up once a day to check range.