@Rich Meister, on battery degradation we can assume safely that it will be similar on X and S (same battery packs). You can get a lot of info on the Model S threads with a lot more statistics since first S hit the road in 2013. Bottom line is that battery degradation is on average minimal, first year sees the biggest drop, 1 to 2% then less over time.
Case in point, after 50,000 miles in 2 years my S85 was still charging at 237 miles (90% charge) and 264 miles (100%), while it was respectively 242 and 269 miles when brand new (EPA rating of 265 miles on full charge). I was charging to 90% most of the time and would use 100% ahead of long trips without troubles.
Typical case scenario so far indicates that you can expect to keep at least 93% of the original capacity after 100,000 miles, and probably more if you don't overuse 100% charge frequently and with all the advances Tesla has made on battery packs since then.