One of the most common biofuels is ethanol. Ethanol is an alcohol created by fermenting starches and/or sugars, biomass that is high in carbohydrates. Ethanol needs a specified engine to be act as fuel in its pure form. It is typically blended with gasoline to boost octane. There are Flex Fuel vehicles which accommodate fuel with majority ethanol content.
Biodiesel is alcohol based but is mixed with vegetable oil or grease from cooking. Like ethanol, an engine must be modified to run on biodiesel but it is low emission alternative to diesel fuel.
Waste Vegetable Oil (WVO) is a great eco-friendly fuel. My uncle has converted his diesel Mercedes to run on vegetable oil. He gets it for free every time he eats lunch at one of his favorite restaurants in town because the restaurants cannot legally use it twice for health code reasons and would have disposed of it anyway. My uncle has a filtering system for it at his home.
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