The 2 FFV cars I've had run the same either fuel, only bad side of E85 is reduced range. I've run E30+ blends in 2 other cars with no driveablity or starting issues.
As I said above my 2 FFV cars burning E85 were actually more efficient in converting chemical/potential energy of E85 into mechanical energy, than they are with E10.
But I think they can still get more out of E85 if they crank up the compression or add a little turbo boost(FFV Cruze?). I'd buy a E85 primary fueled car, that could still limp around (like sports cars that wants 93, but will tolerate 87 with reduced timing).
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