e85

Sorry for the confusion...yes , that is my mechanical compression.
I have heard much higher numbers , but over 14:1 I would be leery.
You are squeezing it hard enough to warrant methanol at that point anyway..........not really practical for a streeter , but it has been done.
E-85 is around 105 research octane as I understand it , and closer to 99 when averaged with the motor number.
Up to 13:1 with good quench and aluminum heads , it just makes too much sense for my deal.