Battery life on my Pixel 2 has been about the same. When I do have battery issues, like I have recently, it’s generally down to a rouge app not shutting down.
Annoyingly often that rouge app is a Google app such as Play Services or just the main Search app. Even more annoying is that it doesn’t often show up on the battery stats so it’s a real guessing game.
Two days ago, after many issues with standby battery life after Android 10, battery stats finally showed me that the Google search app was running constantly and sucking what little battery my aging Pixel 2 has. A force stop, cache clear and reboot seems to have resolved the issue.