How do I get to 100-105 octane?

[slightlybent47]

How do I get to 100-105 octane?

I have a ex with 12:1 compression and need to keep my octane at around 100 to 105.
I have been using U4.2 (102 octane)as a direct pure in and it works great but my supplier has quit selling it. The most common fuel sold around here is Dragon fuel and Sonoco,
Using 93 pump gas as a base what fuel should I use and at what ratio should I use to get it to 100 to 105 octane?

Is there a scale or formula that’s used to achieve this?

What octane should I stay at?

Thanks

[Wildbrain]

Go to your local oil co. or gas station. Get some Cam-2. It is 112 octane.

The stuff works great in high compression bikes.

It is a leaded fuel and actually helps your motor run a little cooler on those really hot days.

[VTredneckgames]

and if you cant get that, you can use the old method of mixing with toulene or xylene. But I dont really recommend it.

And do not bash me for saying that. As a last resort, it works just fine.

[kodymx13]

with a 12:1 you dont really need that much octane. i have a crf with 12:5 and can run just 93. but most of the time i mix 93 with the sonoco 10.. something i get at my local chevron.

[450rJam]

any small airports close ?

alot of friends run 100LL avgas for high compression motors
(atv, snow mobiles, race karts, jet ski etc.)

no problems (couple run mystery oil with it)

cant beat it for cheap high octain fuel
(and it lasts a long time in storage)