Has a College Football game ever ended 75-31?
Exactly once. On November 26, 2016, Navy beat SMU 75-31, and no College Football game before or since has ended that way. When it happened it was a scorigami, the first 75-31 in league history.
That makes 75-31 the 1819th most common final score out of 2,215 that have ever occurred in College Football. One point away, 76-31 has happened 1 times and 75-32 has happened never.