E85 is a tiny sliver of national fuel sales, and between its highly variable price and lower energy content per gallon, most buyers with E85-capable models never put it
in their tanks.
In order to meet the rising mandates for selling more
ethanol, at some point oil companies will have to mix more than 10 percent ethanol into everyday fuels—a milestone known as “the blend wall.”
The EPA estimated that its 2016 mandate would require ethanol in 10.