2 gallons of toluene ( jet fuel) in a full tank... can get it cheap at most if not all hardware stores.. go to gnttype.org for more info
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The consensus you're going to get is additives is a waste of money and are not effective in sufficiently raising octane. I've also read that Torco Accelerator has been used by some with some success but don't have first hand knowledge of this. E85, alky, or race gas is what most here successfully run to raise octane.
I've used two with good success put 5 gallons toluene in a empty tank and top it off with 93 ! When I ran the car on the street as a daily driver this is what I used 20# boost all day long no knock
Also did the same exact ratio with xylene same results! I will say alky has taken this option and thrown it out the window so it isn't the best option anymore
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Very true. Having to mix fuel all the time does indeed get old fast. And the ratios are never exact and introduce variables in your fueling..I ran xylene mix for a season with a 100 octane chip. Ran great, just got tired of mixing.