I understood that as soon as I read it. Most of the gas, in the midwest anyway, is blended with at least 10% ethanol. Then you add in the E85 which is 85% and that quickly eliminates the fraction of unblended gas sold - leaving the actual blend percentage much higher than 10%. I don't believe it makes economic sense to run E85 at this time based of fuel pricing and the mileage obtained. Yet to be determined is the ecological benefit - cleaner burning - less emissions - possible improved engine life.