So I remember some of you from our delivery "waiting group"
I just turned in my S70D (locked 75D) with 17000 miles, and here's what happened:
On delivery: I had 236 miles on a full charge. Sometimes 235. 90% was 212.
~4-5 months into ownership: Suddenly started seeing my 90% drop to 210 and then 209. Confirmed that my 100% was affected too: Down to 232 or so.
Towards end of ownership: Was seeing 229 at 100%, 207-208 at 90%
Overall I'm not as unhappy about the degradation than I am about how the car didn't really start out at the EPA rated range for a 70D which I believe was supposed to be 240 or so. Come on, it's a locked battery, trim it to EPA rating!
FWIW, my new 100D seems to have made up for it. EPA rated for 335, but at delivery I was seeing at around 344 and it was still not charged to 100% (though nearly).