Brazil has the most experience of operating vehicles on ethanol, and
the determined researcher will look to their experience.

Any engine that has a BSFC as good on E85 as on gasoline is a
seriously misdesigned one. There is, as a point of interest, just such
an engine in existence-the air cooled, horizontally opposed high
compression Lycoming aircraft engine. Because there is a Supplemental
Type Certificate allowing for legal use of ethanol fuel in certain
Lycoming engines in certain airframes, a significant collection of data
points exists.