I think I understand, but it would be 5 gallons of E85 or whatever it ends up being and 10 gallons of E10, so say it is E70 at 5 gallons, and E10 at 10 gallons, that would convert into E30. am I doing the math right? I would do that ratio because I have at least one empty 5 gallon gas can, and I have another 5 gallon gas can, but I don't remember if it is empty. and my other reasoning is that by only doing a 33% E85 blend, the mass air flow sensor should be able to add enough fuel to compensate. E85 has about 30% less energy, so it needs to flow that much more. so E30 would need to flow about 15% more fuel, which the mass air flow is able to calculate and with an adjustment it should be within 5% of 0. I could richen up stoich as needed.
