I already put this in another thread, but putting here also as it fits.
For the first 4 months or so I charged to 90% every night regardless of where my battery was at. During that time it charged to 279 miles at 90% every night .
About 2 months ago we have the idea that maybe we should only charge when we needed to, so we started charging when the battery got below 50% only and sometimes would go 3 days with no charging. During this time I saw my battery steadily drop to a low of 268 miles at 90%
A month ago I started charging to 90& nightly again regardless of battery status. I have steadily climbed back up and this morning was at 278 @ 90%.
At least my Tesla for this one specific items, likes being plugged in daily it seems.