Anyone know what the conversion to compare Gasoline to E-85 per unit of air?
I think E-85 has about the same BTU / gallon as propane 84250, and gasoline is 116090 btu/gallon, but Gasoline (ideal) Air Fuel ratio is 14.7:1 where E-85 is 9.7:1, so you can burn more E-85 fuel with less air to make up the difference in BTU, but I don't know how to compare the two.

Just trying to see which has the greatest BTU for a given amount of air, even though you will still be using more E-85 fuel.