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Really its just common sense, I wrote a research paper for school on this very topic about 4 weeks ago. The cost of gasoline is to cheap for any other type of fuel/alternative to break its hold on the majority of the market. Thats really the only reason, we consumers don't want to spend the cash.
Even the EPA estimates that gas has to reach $5+ a gallon for over a year before any of the alternatives start to have a financial advantage over gasoline. (I can give you a direct quote from the lead guy on ethanol with the EPA)
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