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When it comes to alternative fuels in Colorado, compressed natural gas (CNG) or liquefied natural gas (LNG) usually gets all the attention. But some drivers seek out other fuels, such as biodiesel — a fuel made from vegetable oils, animal fats, or recycled restaurant grease and typically blended with petroleum-based diesel.
Jessica Farris, who is pursuing her master's degree in journalism from the University of Colorado Boulder, likes to put biodiesel into her 2006, Volkswagen bug — which sports…