CB,
I don't know how much the vapor pressure changes between regular 87 octane
and say 93 octane, without looking it up. However, the higher the octane the
higher the vapor pressure.
This would be the opposite of what you thought.
The higher octane fuels are actually a more suppressed "volitility". It
should therefore, take a higher temperature to vaporize.
This is the reason why high compression engines have to run on high octane
fuel, so they ignite on spark, not on residual heat/compression.
REgards,
Bob - BJ8
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