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I will say that even though I lack instrumentation, when I get the CEL there are no symptoms, as in, CEL on and engine still runs perfectly, no stumbling, hesitation, or anything. So mixture must be good or at worst not that far off.
Different vehicles respond differently. Straight E85 in the Tempo will light the CEL 100% of the time until I blend in more regular. However, straight E85 in the F150 results in the CEL under some conditions and then it goes out. I figure pickups are allowed to go a bit richer than cars under some conditions because they are expected to work harder. Either way, the only operational issues I've seen with many years of E85 use are harder starting/stumbling when cold, all of which goes away once engine warms.
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