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a word of caution regarding the octane levels of e85... i read a blurb somewhere not overly long ago that followed a study that took samples and check the octane level of e85 fuel from an array of gas stations across the midwest. they got readings all the way from 110+, to below 85. notice that e85 is not labeled as having a certain octane level. as a generality, yes it's high, but the longer it sits, the worse it gets. so if you are maxed out on timing and tuned for 100 for example, and you get a batch of sub 85, you're engine is going to hate you.
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