That's a good point, Sam...99% of the folks out there have no idea what their *actual* CR is...unless you cc everything you're just guessing. I'd say the vast majority of the engines out there are well below where their owners think they are. And while running too much octane isn't as physically detrimental as running too little, it *will* hurt you performance-wise, and make your car temperature sensitive...been there, done that!
