12.5 to 1 What octane do you run!!!

Well have done some reading and learning. My buddy that has been supplying me with the 112 fuel. Well, it is Sonoco supreme 112 aka R+M/2 octane rating. "Motor octane" rating for this fuel is 107. So the octane is not as high as i thought at first. Example VP rates there octane by the "Motor octane rating" So, the popular VP C12 has a vary close octane rating of 108.

Moper, still learning what it will take to go with oxygenated fuel. some say you need a purpose built carb, other say you need to go up 3 sizes and no other mod to the carb.!? Have also noticed that there are different percentages of oxygenated fuels. percentages from 2.7 (By weight) to 10% I have read that each jet size equals 4.5% change..........how complicated is the math......does 10% oxygenated fuel equal 2 jets sizes bigger 4.5x2=9%??????? E-85 look interesting but one, i don't want to buy a new carb and 2nt a e85 station is over 100 miles a way. Not practical