Mixture in il2 1946.

[Luno13]

1 - From what I can tell it's fairly simple. The engine runs rough once it hits the target altitude fairly suddenly, and I don't think the game models the temperate of each cylinder and the effect that has. It's good enough for air combat scenarios however.

2 - Automated. US planes had a couple of settings like rich of peak and a bit leaner for economy cruise, I think, but it was mostly automatic.