I am working for my mother actually as a lab technician (While I decide what I am going to study if it ever happens), her lab does pesticide analysis on export fruit and such things.

We still add good old lead to increase octane. Our 95 is unleaded and the 97 is not, generally speaking.

I have an old stihl engine that a want to experiment with, its the 30cc it looks remarkable similar to the ryobi, should make for comparable results.