Back to the 11 to 1 C.R. question. I concur with several opinions on this thread that with careful use (no lugging of the engine under any circumstances) and alloy heads it won't be a significant problem.
Here's one example of a "point" from a Tuner Web site study.
Quote:
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Published third-party information about 104+ Octane Boost claims a "five-point" octane increase, which, in marketing terms, translates to a 0.5 jump in the AKI octane rating.
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AKI (anti knock index) is really the most important number to be concerned with here, it's essentially an average of the RON (part throttle test procedure) and MON (full throttle test procedure).