im wondering if mixing one of these guys with your gas will safely increase octane rating. many of those solvents listed would probably be incompatible with many of the plastic and rubber parts used in the fuel system.

methanol and ethanol would be safe though. you can buy MeOH and denatured ethanol (they use methanol and isopropanol to denature it these days) at osh.

mix a specific volume of the alcohol with your gas, and in theory you will have increased the octane rating.

I know it is not as simple as this, so I am wondering if anyone has ever had any experience with this?

Carbon Hydrogen [Toluene. M-Xylene, etc] fuels are a better bet.

If plug and cat fouling and deposit build up is not a concern then the organo metallics are useful....................MMT, Ferrocene, even tetraethyl lead since a little dab will do it.

not easy and not cheap, also tert-butanol is solid at room temperature, but you can dissolve a specific proportion of it in gas without having it solidify.