With the advent of winter in Chicago my 2015 Tesla 85D 4 months old / driven 5000 miles looses almost 40-50% range.
Jan 18th - The car was charged to 237 and was preheated to 72 deg F before leaving the garage. Drove 106.3 miles and had only 44miles left on the battery range indicator (yellow battery icon) - outside temperature 6deg F. NET LOSS OF RANGE 87 miles (the 44 miles would only have given me a another 20+ miles of range.in which the loss would have been 107 miles on one trip.
Dec 23rd - This loss of range was noticed earlier LOSING 70 miles on a full daily charge outside temp 42 deg F.
Tesla tech had advised me to preheat the car after Dec 23rd issue to heat the car which also triggers the heating of battery pack 30 m before leaving. Heating the battery pack apparently draws a lot of power to heat the battery - pumps - coolant heater etc - they also advised me to keep it plugged in at all times when not in use at home.
DAILY LOSS PARKED IN GARAGE IS 3 to 7 miles. Please let me know for those living in cold weather areas if you have noticed similar loss of range as I would like TESLA to remedy this.