Quote:
Originally Posted by RCF
Just to clarify some info on ethanol vs e85 vs gasoline...
Pure ethanol has about 30% less energy content per gallon than pure gasoline. Gasoline today (99+%) already has 10% ethanol in it. So E85 (if it's truly 85%, most likely it's somewhat less) would have 75% higher ethanol content than gasoline. 75% x 30% = 22.5% lower energy content for E85 vs gasoline.
Have you checked the actual ethanol content? Theoretically E64 would give you approx 84% of gasoline's MPG (what you're seeing). Knowing your actual ethanol content would be nice to see where you are vs theoretical.
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But the stoichiometry makes it so that a lot more fuel goes in and thus makes more power/heat (btu) for the same amount of air coming in.