BYU's long-term win% vs P5s has been close to 43%. That win rate has remained remarkably stable over the last 50 years.
The 5 teams just above that 0.500 mark (min. 20 games)
Tennessee
Wisconsin
Iowa St.
North Carolina
Oregon St.
The 5 teams just below that 0.500 mark
West Virginia
Kentucky
Purdue
Miami (FL)
Missouri