I had my Model S (85 RWD) for just over 2 years now. I drove 73,500 miles so far. That's quite a lot for 2 years. One of the biggest concerns with EVs is obviously how well the battery holds up as it's the single most expensive part. When I got it new I was promised 265 rated miles. For the first few weeks the 100% charge went even a little higher. Now after 2 years, many long road trips though burning hot deserts and freezing winter storms, several hundred Supercharger uses, my 100% charge is at 253 miles. I have to say I'm very impressed! That's better than I expected and very encouraging! I added my data to the chart here MaxRange Tesla Battery Survey Looks like I'm a little above average which is of course great, but again, I didn't expect it living in a very warm climate which is known to accelerate battery degradation. This google sheet is actually pretty interesting. There is a page sorting the data based on daily charge level and supercharger use. It seems to show that both Supercharger use and charging to 100% more often doesn't affect battery degradation much. At least the data doesn't show a trend. I've also been able to monitor some data from the battery recently. It's stunning that the average difference between the modules is only 4-5 mV which means the difference is only 0.1%. Anyone familiar with battery packs knows this means the pack is kept extremely well balanced. The temperature between the modules is also very close. Usually only 2 degree F difference. Again, that's very impressive. Tesla really has it's BMS down!