1. Wisconsin 2019 (Rose Bowl) 16.3M
2. Ohio St 2021 7.73M
3. Auburn 2019 6.86M
4. Iowa St 2020 (Fiesta Bowl) 6.68M
5. Utah 2019 (CCG) 5.86M
6. Utah 2021 4.82M
7. Oklahoma 2021 (Alamo Bowl) 4.74M
8. Utah 2021 (CCG) 4.25M
9. Arizona St 2019 4.09M
10. USC 2020 (CCG) 3.85M
11. UCLA 2021 3.84M
12. Washington 2019 3.62M
13. USC 2019 3.43M
14. Oregon St 2020 2.8M
15. Wazzu 2020 2.73M
16. Washington 2021 2.73M
17. Colorado 2021 2.67M
18. Stanford 2021 2.64M
19. Cal 2019 2.0M
20. Wazzu 2021 1.99M
21. Wazzu 2019 1.9M
22. Stanford 2020 1.66M
23. Arizona 2021 1.66M
24. Arizona 2019 1.61M
25. Cal 2021 1.45M
26. Stanford 2019 1.37M
27. Oregon St 2021 1.34M
28. UCLA 2020 1.08M
29. Cal 2020 1.01M
30. Colorado 2019 0.69M

By and large, it looks like Utah does pretty well for viewership compared to other Oregon opponents.  The only games which drew more were against Ohio St, Auburn, or 2 NY6 games.

Part of that is that Utah got two CCG games against Oregon, but those both drew more than Oregon's other CCG against USC, averaging over 30% more.  And Utah's regular season game against Oregon outdrew every regular season offering besides Ohio St and Auburn (who are quite clearly at a different level than Utah)