I upgraded mine on Tuesday morning by joining the beta, installing the update, then leaving the beta. I performed a FDR on Tuesday evening. My battery life was abysmal, barely getting 16-18 hours of light use. Here's the thread I started
https://forums.androidcentral.com/g...7759-battery-life-plummeting.html#post5937667
Last evening, there were a number of updates to my apps
Google Fit
VLC
Google App
Chrome
FB Messenger
FB
I noticed almost immediately that my battery wasn't draining as fast - it lost about 2% in an hour instead of the previous 5-8%.
Went to bed last night - woke up this morning, 8 hours later, and my battery had dropped a TOTAL of 4% overnight. I plugged it in when I arrived at work to top it up, then took it off the charger an hour ago. Right now it's still at 100%.
When I started seeing this, I reported it to Google through the feedback. That was Wednesday. Today my Pixel XL is a whole new phone.
YMMV