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 occasi…

Can I add Xylol (Xylene) to boost octane?

mcparadise May 22, 2009, 1:39am 3

You’re a cheapskate. If your vehicle needs 89 or better then you should feed it 89 or better.

There are no products that will make up the difference.