When parking for an extended time without charging, a display could be shown prior to leaving the car or seen on the phone app. This would show the amount of range if left unused without charging for an extended period, such when left at an airport parking lot. If the range is affected by temperature, it would factor in the average temperature too.
For example (with totally made up numbers):
10 miles – 67 days
50 miles – 39 days
100 miles – 18 days
Requires a software change.