Battery degredation seems to bottom out between 85-90% capacity on most cars after a lot of miles. Likely will never need a replacement.

If I recall correctly, most of the lowest performers are older S and X. The 3 is expected to degrade even slower with their improved battery cells and thermal management.

https://electrek.co/2018/04/14/tesla-battery-degradation-dat...

So far all we have is anecdotal evidence

https://www.teslarati.com/tesloop-tesla-model-s-400k-miles-b...

Is it better or worse as far as total costs compared to a Mercedes-Benz with 645,000 km on it?