necessary to supress detonation. 112 sounds a little much for stock turbos and (as I remember) 18psi. I don't know what you bump your timing to. I run 24psi and 22-24 degrees of timing with a 50/50 mixture of 101 unleaded and 112 leaded. I also take 2% of fuel out of the program at the strip. And yes you CAN mix fuels, however the resulting octane isn't linear (ie. 50% 100 and 50% 110 does not equal 105 octane). There is a formula for the octane mixture that you can get from Unical (Union 76), I've got it around somewhere and will send it to you if I can find it. It's certainly a better idea to "over octane" the mixture, than to have an octane deficit and have you engine go bye-bye, but again you can over do it and actually hurt performance some. Also, the 112 octane I am familiar with states that it actually richens the mixture about 2%, I don't know the dynamics behind that. Good luck in your quest for the 11s. Take care, Mark
