Life with Tesla Model S: assessing my new 100D vs old 2013 electric car

2017 Tesla Model S 100D   [photo: David Noland, owner]About two years ago, under the influence of an eager Tesla representative, I briefly considered trading in my trusty 2013 Tesla Model S 85 for a new Model S 90D. But after a 24-hour test drive, the advantages of the 90D—40 miles more range, all-wheel drive, and Autopilot 1.0—didn’t seem to justify the $40,000 cost of stepping up...