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The Environmental Protection Agency continues to give the green light to E15, but the biofuel doesn't have to come from corn ethanol. The exact source of the ethanol in gasoline – whether its 10 percent ethanol (E10) or 15 percent (E15) – isn't impacting the E15 debate, it does in the "food vs. fuel" debate, and that's why a potential solution coming out of Colorado caught our eye.

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