Ill add to this: notice that not once in the last 20 years has BYU ever won a game by more than 7 points. None of those four games involved BYU having any significant lead on Utah until the last minutes.
The rivalry game is close more often than not. But in the last 20 years, we have also won several blowouts. BYU has to go back to 1996 for its last blowout win over Utah.
Says a lot.