Biggest P4 win margin since?

[Baz = Heisman]

Maryland 2020?

 

[BFDCat]

Minnesota 2017. According to Google we've only had 4wins of 30 or more over a Power 4 team in the last 25 years.

 

[CappyNU]

Maryland 2020 is the answer, and then the back to back weeks of Minnesota and Illinois in 2017.