Quote Originally Posted by dhemi1
Hey.

. Do you think this is due because 91-93+ octane fuel vaporizes more readily?

-CJP
The measure of how "well" it vaporizes is measued by Reid Vapor Pressure (RVP), that's really more value at startup, nothing to do with octane rating level. If anything the higher octane rated fuel has more complex molecules that would likely vaporize less easily, thus resisting ignition "too soon" as only in a vapor state will it burn, not liquid or solid.