I have an S12 ultra and it's used 9% of the battery today - I don't have it activated in the car yet.So I'm not alone in observing the Polestar app being battery hungry, thanks. Good to know, even if it's not good.
I also have a pixel 4 XL and it doesn't even make an appearance on the list of battery hogs.
Both phones have the same level of permissions granted. Maybe the S12 will get its act together once the app has been on there a couple of days.