I use Xylene. It's the same additive in fuel cleaners and the primary octane boosting agent in fuel. I add a gallon of xylene to a tank of premium unleaded with an additional ounce of marvel mystery oil as a lubricant. This works fantastic! Xylene is available at paint supply shops and even Home Depot.
I know people who have had good luck with torco race fuels
follow the direction and add to 93 otane and added to a 19 gal gas tank to get the equivalent of 96+ octane... can be made to 107 octane ... unleaded
no need to carry lots of race fuel. As far as I can tell they do not sell directly to the customer, so I guess it is okay. Admins feel free to remove link if there is doubt
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