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Tesla S 2015 60 kWh discharging too fast when driving…

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I bought this used Tesla S 60 earlier this year. The battery charges up to 206 miles when at 100%, which is very close to original even though the car has 94.000 miles. The problem is that all of a sudden the discharge rate is crazy fast. Even when driving with a light foot a 19 mile drive (yesterday) “depleted” 50 miles of range. This in suburban driving. The 3.3 mile ride to the mall averaging 40 mph with few stops depletes 8-10 miles etc. On 65 mph steady cruise control highway driving to Boston last week 180 miles range depleted down to 30 miles after 90 miles actual driving. Is it possible that batteries “collapse“ and need replacement all of a sudden? The car is still under warranty and there is a large Tesla center just a few miles from here. Any suggestions what to do? I have maybe 60 miles of range in reality based on charging up to 180 miles range as I will be down to 30-40 miles within 2 days… I live on Long Island, NY and the weather has turned cold with the average outside temp being 30 degrees at night and maybe 40 high on daytime. Amy ideas? The car is awesome others and in perfect shape.
 

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With my first Tesla I was very surprised by the actual range vs. advertised range -- especially in the winter. If you're averaging 375 wh/mi assuming 100% of the battery is used for driving (it is not) 60,000/375 = 160 miles and that is generous. It gets better in warmer weather.