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[quote]QUOTE: Originally posted by Overmod Don't wait too long. Ethanol is, how can I put this gently, not meaningfully compatible with fuels for compression-ignition engines. [/quote] O, you are correct, which is why it would be more prudent for alcohol fuel proponents to focus instead on higher chain alcohols like isoproponol and butanol, which are compatible with both spark ingnition and compression ignition engines. There are processes now commercially available which can produce these higher chain alcohols from both grains and biomass, so in that respect ethanol is old hat, being pushed solely for political reasons. Of course, the bigger picture is that such renewables can never amount to more than a small fraction of the nation's fuel supply. Which is why if we get to the point of petroleum unavailability, the next logical energy sources for railroads is in coal/coal derivatives and/or direct electricity via catenary.
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