Visited a friend recently, he plugged me in to his company's L2 network while we ate lunch (a *very* long lunch) and went to 'full' for the first time in .... 4 months? Temp was around 78 degrees, and I was very happy to see that my 2015 Spark EV had a full range of ... 106 miles. Yes, it's based on driving habits and temp, however my original 2016 (the one my wife totaled) almost never got over 110, so I am very happy. The car is over 4 years old and still has most of its battery capacity. I think it is because *I* don't charge to full very often (generally between 75-80%).
DrMorgan, have your experiments on 'not charging to full' revealed less battery capacity loss, or is the battery degradation still fairly linear on your two?