Has there ever been a 11–5 in the Brasileirão?

Never.

It would be a scorigami. Based on the average number of goals in the Brasileirão, the chance of a game ending 11–5 is about 1 in 685,842,267.

Nearby scores

1. 12–4 Never
2. 12–5 Never
3. 12–6 Never
4. 11–4 Never
5. 11–5 Never
6. 11–6 Never
7. 10–4 Never
8. 10–5 Never
9. 10–6 Never