Has an AFL game ever ended 91-40?
It has. 91-40 has been a AFL final 3 times in 16,622 games. The first was Collingwood beat Melbourne on August 29, 1903; the latest was Richmond beat Geelong on September 8, 2017.
That makes 91-40 the 1534th most common final score out of 6,607 that have ever occurred in AFL. One point away, 92-40 has happened 1 times and 91-41 has happened 2 times. At one point the score disappeared for 112 years, between 1905 and 2017.