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Ethanol:

10% Ethanol has a higher octane, but it is NOT better unless it's cheaper.

Description Octane $/Gal MPG $/Mile
Non-Leaded Gasoline 87 $2.850 30 $0.095
10% Ethanol 89 $2.850 25.5 $0.112

 

Description Octane $/Gal MPG $/Mile
Non-Leaded Gasoline 87 $2.850 30 $0.095
10% Ethanol 89 $2.423 25.5 $0.095

So why do we want E85?