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Originally Posted by DonneyEV
I have been told that biodiesel has a better BTU output vs input ratio, about 3-to-1, than ethanol.
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People often look at corn-based ethanol and don't seem to realize it's roughly a byproduct of a high-protein substract most often used for livestock feeding. On the other hand, besides the BTU output, some major advantages of biodiesel are the possibility to raise some crops such as Castor on brownfields in a way that not only increases the biological stability of such environments but also decreases the impact on the usage of arable land for food production.
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ethanol production (ethyl alcohol beverages) has been around for about 10,000 years
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Knowledge about the alcoholic fermentation process being so ancient, and relying historically on so many feedstocks, is one of the reasons why I don't believe the internal-combustion engine could become effectively obsolete so soon...