It’s a Model S 85 with not quite 60,000 miles. From what I hear from other owners, this is slightly better than average but not much. I haven’t done anything special to treat it well, either. I charge it to 90% nightly (the default), charge to 100% before long trips, and have used Superchargers for maybe 20% of those miles.

Not sure what the parent drives but there are a number of variables to consider, for example with Tesla supercharing often will degrade the battery faster as will charing it in trip mode for the same number of miles driven, but there is a good amount of data out there for this car.

https://www.greencarreports.com/news/1110149_tesla-model-s-b...

"But, overall, the data offer some basis for confidence that a Tesla Model S will lose—on average—less than 15 percent of its battery capacity over the average 150,000-mile (250,000-km) life of a vehicle."

I have a 2011 volt and have had negligible degradation. Thats an N of 1 but from GMs data, degradation hasn't been an issue in volts.