PeteWhen I charge to 90% I get 180 miles. For whatever reason if I do 100% charge I don't seem to get much higher mileage wise. So I am also having the same result as you do. I would like to understand better also..
I also live here in Chicago - NW burbs. I’m a new owner (< month) but since I’ve had the car on 100% charge I get 220 miles and on 80 ~180.
I usually drive the car in stretches of 20 miles - suburb traffic - at a time.