Whats does everyone use for fuel at autox.. I have a pretty aggressive tune.. and do not get out of 2nd gear. Id like to be able to bounce of the rev limiter and not worry about something blowing up.. Since we only have 91 octane in california.. i would prefer some extra measure of safety. I used Toulen the last time and the car ran great.. pulled harder, ran smoother and got better mpg. Im wondering if I should go this route again.. or just add a few gallons of 100 octane or c116. If I have a half tank of gas.. how much c116 should I add for safety?

 

Usually adding about 2 gallons of 100oct should do the trick ... since half a tanks is about 7 gallons of 91oct ... that would equal about ...
~93oct .... thats 2 more oct pts. of safety