Thinking about selling or trading in my Model S. Interested in informed opinions here on 2 values: trade-in and private sale. The window sticker is attached. It's a 2014 S85 (december 2014 delivery, serial #63xxx), original owner, excellent condition, no accidents, in Central California. Note that it does have autopilot and is fully optioned. Original sale price was $102,970. My opinion: private sale $50k, trade-in $45k. Thoughts?