sixstarved is right. It's all in the cam. Static compression ratio doesn't tell the whole story. Dynamic compression ratio is the true measure. If there is a lot of overlap in the cam, the valve closes late and you do not see as much CR as the static number. So an engine with a 10:1 SCR can handle lower octane fuel than a 9.5:1 SCR engine, if it has a lower DCR.
I know that washing and waxing my car with the present condtion of my paint is like polishing a turd.....but it's my turd and I want it polished!
![[Linked Image from imageshack.us]](http://imageshack.us/photo/my-images/845/turd2.png/)
