Originally Posted by rob-2
It can be done. Consider new turbo'd motors have got down to 87 oc.
Most most cars have knock sensors so it's not a huge deal. Typically the problem only comes up in high rev bad gas.
I've also run 11.1:1 motors on 87 oc that were design for 91 oc for over 100k miles.
Say that here and people go crazy though. Expect to get flamed.
Ah the benefits of having direct injection where there is no knock and octane doesn't really matter <sigh>, like the MazdaSpeed6
Also, OP, thank you for cleaning up your grammar, spelling, punctuation, conjugation, and.... well, all of the deficits. Reading your posts left me with flashbacks of my grandmother correcting my speech and writing when I was a kid (she wasn't even a native English speaker). Adult is as adult does.