Stranded? I think that is a bit extreme. If you asked any car owner to walk into the garage hours and hours after driving for 10 minutes I doubt they would expect any car to be doing anything. Losing 5 miles when you drive 20 in a day does not compute in my book, but I am not stranded. Our 3 is our around town car and local car. Very little daily usage
Do you have Sentry turned on at home? If the car isn't sleeping, it will loose range just sitting regardless of any fans running.