i was going off of the higher the octane number; the higher the temp and stability the fuel will burn at
fuel will flash at a higher temp at 98 octane than at 87.
also fuel will burn faster with a lower octane than with a higher rating, hence it's less stable.
if the fuel starts to burn too soon, you get preignition, if it burns far too soon and the flame fronts collide, you get detonation.
not my ideas, i read this in hot rod magazine about 10 years ago so don't fault me :dance: