Actually E85 has a much wider "Sweet Spot" vs Gasoline. On a boosted car, I have seen from as much as .7514-.8743 Lambda make about the same power. (Yes I know .8743 sounds lean but on E85 it has been OK) On a N/A car I would think the same applies but I don't have as much experience with N/A motors.The ideal lambda wot power zone for ethanol is very similar to gasoline. If I'm wrong maybe Kevin will pipe in.
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