howdy,
ran across this and thought someone might find it useful

http://www.speedwaybids.com/DynamicC...Calculator.php

played with the calc for awhile and noticed volumetric eff. plays a pretty big role in their suggested octane rating. I guess most people assume 80 percent
found this also

http://www.installuniversity.com/ins...n_9.012000.htm


just some food for thought