Yeah, those prices are a few years old, was trying to pass on the formula not thinking of the prices... as all other petro products they are high now, my bad.

This is the one I use in the Harleys, Cobra and the 23............

12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3.

To make eight 16 ounce bottles (128 oz = 1 gal):

100 oz of toluene for octane boost
25 oz of mineral spirits (cleaning agent)
3 oz of transmission fluid (lubricating agent)

This product is advertised as "octane booster with cleaning agent *and* lubricating agent!". Diesel fuel or kerosene can be substituted for mineral spirits.