I have 100,000 miles on a Chevy truck that has mainly run on E85. I have done extensive mileage comparisons and came to this conclusion.
As long as the price difference between E85 and E10 is $0.35, it is a break even endeavor.
I have not run enough 87 with No Ethanol to determine a price break there.
What little testing I have done at the blender pump (E20, E40 etc) tells me that we can go to E20 with no difference in fuel mileage with E10.
As for running in small engines, we have had 0 problems in all the cubs we have had, or still have that are abnormal to normal wear and tear using both E10 and E85. You have to pull the choke lever out a bit to richen up the E85 giong into a Kohler 2 cylinder in a 782, but otherwise, it runs just fine and the motors are clean as a whistle.
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