My 90% fluctuates from 214-218 miles. But when I change the RM to %, sometimes it shows 91%. I think this is what some people are experiencing.
Interesting. My Rated Miles @90% are currently at 216 and have been there since they dropped from 218 a while back. That has been my pattern. They will be at a given number each time, every time until it drops, then it will stay there. I never see any change whatsoever over firmware updates.
I recently switched to % from Rated Miles on the dash because I was just obsessing too much about it. If I charge to 90%, the car shows 90%. I've never seen it go up, but if the car finished charging to 90% at work by, say 2:00 PM, it will be at 89% when I leave at 4:30 or 5:00. (Energy Savings OFF; Always Connected).