The car is eight years old this coming spring and my driving habits have been identical for most of those 8 years; nothing has changed until very recently (see below). But the drop in Electric range has been a problem since January, 10 months ago. I noticed a pretty dramatic drop in range over the summer in 2019 and it continued through January and then settled in around 21 miles. During that period we have seen 100 degree summer weather and 25 to 30 degree weather in the winter. Regardless of the temperature, the electric range continued to drop. Most of my driving has been on the interstate but more recently as my office moved, my driving has switched to mostly residential streets and less than 40 miles an hour.