i'm going to be starting up my motor soon, it is around 12.0-12.3:1 and completely untuned. i want it to last till i can get it tuned, i won't be leaning on it too hard, but i was thinking of starting it up on 100oct. the next highest i can get is 91, i was wondering if i can dump some alcohol in with it to lower the octane, if so how much for what octane. or is this comletely ridiculous?

 

you could mix some tuelene with your gas to bump octane and if you run 91 octane, just back timming up

 

there is a thread somewhere that i read that had the octane rate for each compression level you run..search and see what comes up. good luck