In my past 12 seasons, I was allocated in mixed leagues for 3 or 4 times.

In the last season, my team & 3 friends (all are level 11) were allocated to a league mixed with level 12 and 11 teams. This is a tough and interesting season. The performance of the top 12 teams are close. I am satisfied that my team greatly improved since late 1st half of the season and eventually became the only level 11 team promotede.

BTW, except last season, the number of higher and lower level teams are even in my other seasons in mixed league.