 Save Gas! How to Make BIO-DIESEL from VEGETABLE OIL #45 US $5.35 
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Where does the 'bio' in bio diesel come from?
In other words...is it corn? I realize Ethanol is corn based, how is bio diesel different from Ethanol? How much of bio diesel comes from used cooking oil? Or is it mostly bio mass food...that is corn, sugar beets, etc? I am not in favor of the corn subsidies and Ethanol being what the government proposes as the solution to energy problems, but how is bio diesel different or the same in terms of costs to land use, efficiency of what is produced, etc? Ethanol is rather inneficient, no? So what of the production for bio diesel? Is it coming from more energy efficent sources, or is it mostly corn? Thanks.
Many of your observations about ethanol are point on. {Editorial comment -- we would actually save substantially more fuel by raising gas mileage standards than by manufacturing ethanol. Ethanol will probably prove to be a farm belt boondoggle}. Diesel engines can actually run on a varierty of vegetable oils, like soybean oil, but there are some technical issues about "lubricity" and vegetable oils turning to a gel-like consistentcy in cold weather that makes them hard to use without heating them up to make them flow into the combustion chamber. The "bio" in bio-diesel comes from mixing a vegetable oil with diesel fuel. The mixtures seem to be about 10% veggie and 90% petroleum distillate.
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