There has been much discussed about amsoil & all oils in general, I am not being argumentative just relaying what I know.

Touchdown, that being said, I would run it at 80:1 if you want to. The manufacturer instructs up to 50:1 in commercial/industrial use. It's right on the back of the bottle.

More importantly than which high quality oil you burn, is to have your engine tunned correctly AND well ventilated.