I've been keeping track of the Rated Miles over time, software versions, and lifetime mileage since I got my P85D in mid-December. As I'm rapidly approaching 10,000 miles driven in a little over 3 months later, I figured I'd share the results so far with everyone. In the chart below, I've plotted the events at which the rated miles that the car showed at 100% or 90% charge decreased from a previous identical charge, with RANGE MODE set to OFF (turning it ON adds 3 miles): Please note that the initial numbers at 0-3,000 miles have been normalized to account for the differences in range reported at different software versions. For those who remember, the initial range was stated as 242 miles for 100% charge (this is what my Monroney sticker showed), then it went up to 252 in a subsequent early release, and finally 253 to match the official EPA rating as stated by TM. For some reason though, I did get 254 miles at 100% (and 228 at 90%) before it lost a mile. Anyway, I've also plotted battery capacity in % terms based on the normalized rated miles of a 100% theoretical capacity: And finally, for those interested, here are all the data points I have been logging over time and mileage, including software versions: The numbers in brackets are with RANGE MODE set to ON, and all the other numbers are when it was set to OFF. It would be interesting to see if there is a trend line that a regression analysis could predict to see where the battery will end up at, say, 50k-100k miles, then compare it to actuals later. Which reminds me, doesn't TM guarantee the battery will hold 80% of its original capacity after 8 years/120,000 miles? Or is that a CA mandate I'm remembering, by which all EV manufacturers must abide?