There are websites where users report their data. See some of the compilations here https://www.findmyelectric.com/blog/how-long-does-a-tesla-battery-last/ htt

There are websites where users report their data. See some of the compilations here https://www.findmyelectric.com/blog/how-long-does-a-tesla-battery-last/ https://www.findmyelectric.com/blog/how-long-does-a-tesla-ba... "Over the years, the Model S has shown a battery degradation of less than 20% over 300,000 miles from Tesla owner reports on Plug-In America (manufacturing years 2012-2019)."