we buy 116 octane in 55 gallon drums

12:1 might ok on pump with some timing retard, if not its easy enough to take some dome off them and lower the CR a little... kinda a pain in the a s s tho to rebalence em... but you can always reduce CR can't increase it very easily...
maybe 11.5:1's, i'll have to check all my sources and see what is available... its a fine line there between 11.5:1 and 12:1 its so close to knocking with the 11.5:1's that who knows lol its totally up to my particular engine basically if its going to or not... ferrari uses 11.4:1 as OEM on 360 modena, nice engine management tho dual bosch motronics...
btw i can run leaded in my car don't worry about that
lol yeah mixing fuels to get an octane is ghetto, i knew a guy who was a total dumb a s s who used to mix xylene paint thinner, which is like 120 octane and pump to come up with ~ 100 octane... lol i used to give him mad amounts of s h i t, who the hell dumps 15 grand in mods into a 30k m3 then cheaps out on the fuel?