So Toulene is the easiest way to improve the octane rating in gas. Yet it is hell on the cats ( which I don't have) how much havoc will it wreak with my O2 sensors. I am tired of having to pay 6.99 at the pump for 100 octane and where I live I can only get 91 meaning that I have to pull a lot of my timing out of the tune on an N/A set up. How safe is it/not and has any one done it.