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detonation is caused by hotspots, hot spots can be caused too early ignition timing (which is why people associate detenation with too much timing) or by too lean of a mixture or a combination of both, high egt's in general.
E85 is pretty much fully vaporized by the time the piston is on its compression stroke, it does not light off as quick and has a slower burn. Gas and e85 burn at different temperatures and also take not that the auto ignition temp of gas is MUCH lower than e85.
Comparing these 2 different fuels by their octane rating is like comparing your shit to a tv dinner based on how much corn they contain.
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