Hi, I recently bought a used 2013 S with 27k mi. We've driven it a mere 100 miles since the purchase 2 weeks ago, and the SOH has gone from 90% to 87% in that time.
Weather has been 60s-70s, never out of Eco mode, and charging has been 2 times to 80% using level 1.
When it dropped to 89%...