Does anyone know if the eTron's battery charge drops when it is not in use or being charged? And if so, how much does it drop each day? We parked our eTron at airport parking and it will be there for a week. We keep checking the mileage range from the Audi app and it has not changed in 2 days. We are not sure if it doesn't discharge at all while parked or if the Audi app isn't connecting to the eTron since it hasn't been used for 2 days. Does anyone have any experience with this? I would think that the mileage range would drop perhaps 2-5 miles per day when it is just sitting in long term parking.