Fuel made directly from biological sources. Primary examples include methane, biodiesel, ethanol, methanol, and vegetable oil. Oil is not considered a biological source due to the time frame involved. Aside from energy put into production, biofuels are generally considered to be "carbon neutral" because some or all of the carbon in the fuel comes from the atmosphere, and is released back when burned.


Butanol, or butyl alcohol is a more complex alcohol that can be utilized as a direct gasoline replacement without modification. It can be burned alone, or mixed with gasoline without ill effects. It has 10% less energy than gasoline, but a 25% higher octane rating, meaning that with higher compression it should be possible to get more energy out of it, making it potentially ideal as a racing fuel. Most butanol is currently made from fossil fuels but it can also be made by a bacterium, Clostridium acetobutylicum - first used to make TNT in 1916.


E85 is a blend of 15% [[gasoline]] and 85% [[ethanol]]. Many gasoline-powered engines can be converted to run on E85 with little modification. Besides being a simple alcohol, ethanol is also one of our more common [[biofuel]]s.
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