I did 80% for a couple of years, and will still do 80% when it gets very hot (over 35 C) but doing 80% messes up the balance, so I do 90% now (and have gained a few miles back). It would be out of the way to use an SC locally so I don't do that--even if there was one at the end of the block I wouldn't because it's so much more convenient to plug in at home. About 50% of my miles are vacation or other trips, so I do see plenty of SC use. If you check the
what's your 90 thread, you'll see that I'm not alone and there appear to be several who are doing better than I am.
To answer the "50% after 5 years" question, I think they have the Tesla mixed up with the Leaf.