I use 32:1 in everything...It’s funny, the saw says on it 50:1, but the package and manual said 40:1. Haha
I’ve been running 40:1 that I mix, but at the end if last season I picked up a can of the pre-mixed ethanol free VP racing 40:1 pre-mix. I tried to put that in for the “last tank” of the day so if it sits for months the gas doesn’t turn to water.
Stock saws
Ported saws
Vintage saws, and
MTronic saws
So far i have never had a saw failure.
I also use Seafoam in my mix gas, and good oil