A recent question about octane and a visit to a paint store made me wonder:
Can I add Xylene to my gas tank to boost octane? My car calls for 89 or better octane, but I can usually get away with using 89 every second or third fill-up without getting noticeable spark knock. On the rare occasions I've filled with Sunoco 93 octane fuel, I can smell xylol as I'm filling my car. I know that it is one of many additives that boost octane. (by making gasoline burn somewhat slower)
Can I add pure xylene to my tank to boost octane? Do you think it would harm a catalytic converter or oxygen sensors? What would be the recommended percent to add to increase octane a couple of points?
Anyone with some knowledge of chemistry have any input?