>The 98 octane we got here (ROZ/RON) is about the same as 92 octane in US gas.
>This is due to different ways of rating the gas. Or at least so I am told.

Yep but as VW later upped the recc for the MV engine to 92 by US style, it
would be a sure bet (and is by any reality as even the MV pings on 87) that
it would take better than the 92-94ish super stuff available in the US to run
a 10.5:1 CR.

In point of reality in fact, I very briefly owned a '69 vette with I think a
10:1 427?  It pinged like a SOB on anything less than true premium
94 octane.

John
jander14@wvu.edu