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I understand why they don't (the economic ramifications to our oil industry), but I wish they would go with alcohol driven cars. Very clean, very efficient. Yes, alcohol gives off a clear flame, which is dangerous, but alcohol is hardly more flammable than gasoline. If they could add a chemical to make it burn a specific color (like they give natural gas an unnatural, unmistakable odor), it could be one of the more perfect solutions for our dependency on oil.
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