What kind of power gains would you see from 12:1 pistons?

BTW, I thought that 94 octane was good to 13:1. (Don't quote me on that, I'm probably completely off. )

BP

Ben ---'96 Contour GL * Zetec ATX * Tan on Black steelies--- +++JRSC M62 Under Construction+++ My big-a$$ mod list.