I don't have any specific numbers, but before the February update I was able to get to the end of the day 9 times out of 10 with at least 40% battery left. Since the update, my usage hasn't changed but I'm down to 20-30% battery around late afternoon dinnertime. I attributed it to mobile data because none of the other usage percentages have seemed to change.
Funnily enough though, after joining the beta program yesterday and installing Android 12L, it seems my battery life has gone back to normal (no more fast drain), yet mobile data is still holding steady at 21%.