Let us know what the temperature was when you checked...
Just sitting there, the background battery drain isn't very much, and most of it is on the 12vdc, since it runs the alarm, the cellular connection, and essentially all of the electronics. But, the reported max range can change with temperature. Also, are you reading this in the car, or via the app? The app doesn't get updated all that frequently, so I've noticed one thing on my app, and it's different when I get into the car.
Basically, the main high-voltage battery isn't 'on' or doing much of anything unless the car is plugged in, or is in the READY state.
Do you have any recurring departure times programmed? Those will activate the cabin climate control even when not plugged into an EVSE.