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I thought we could use some info on this subjest because it comes up so often. There's much more available, but I have a limited attention span. These sites anwer the FAQ pretty well. Let me know if there are any dead links.
Octane vs. Compression vs. Timing
http://www.diabolicalperformance.com/hotrodoctane.html
Gasoline Before You Buy
http://chemistry.about.com/library/weekly/aabyb100401.htm
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.