My first used saw required a 20-1 fuel mix.
I also have an OLD David Bradley that recommended 16-1.
I bought my first new saw in the late 70’s a Partner P100 100+-cc’s with a 24” bar It required a 32-1 mix.
I then bought a new Jonsered 630 super in 1987 which required a 40-1 mix.
I also have...