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A msg on this newsgroup couple weeks back said you could get 700
gallons of soybean oil from an acre of soybeans, and running a tractor
up and down an acre a couple of times took less than 10% of that amt of
fuel. The Dept of energy says we use 24 quadrillion BTUs in
transportaion fuels... assuming that gal of biodiesel weighs about 7lbs
and produces about 15,000 BTU per lb, you can compute how many gallons
and acres it takes to produce that number of BTUs. I did it and it was
about 10 or 15% the area of the US., so complete conversion to
biodiesel looks feasible to this engineer.
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