To fully get an accurate count of how many fans watched each college football game is complicated. It is also challenging to get the numbers of viewers for games shown on the Pac-12 Network.
UCLA for example in 2022, had their first four games on the Pac-12 Network. There is no public data on how many people watched those games. However, if you take the other nine games and average the number of people who viewed those games and compared those to the other Pac-12 teams for 2022, some would argue that UCLA had the highest average number of viewers for conference games in the Pac-12 for the 2022 season.