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Ethanol has challenges from other alternative energies on the up and coming rise for future fuel use. It being in competition with other resources will have lower its price to compete and try to gain an advantage to other resources such as Bio-Butanol.

Butanol is far less corrosive than ethanol and can be shipped and distributed through existing pipelines and filling stations.

Source:http://www.lightparty.com/Energy/Butanol.html"Bio-Butanol Use" has a significant impact, so an analyst should put more weight into it.