I'm still trying to decide if tests like this are truly steps toward the future or if they are basically just stunts. Right now pretty much all biofuels cost significantly more than the petroleum-based products they hope to replace. This is to be expected, since they can't yet benefit from economies of scale. Still, with 7 billion people looking for something to eat, I have to wonder what percentage of the world's arable land would have to be planted for biofuel to make a significant dent in petroleum usage, and how that would play when the Secretary of State visits some of the hungrier countries.
http://www.marketwatch.com/story/gevo-flies-high-with-usaf-alcohol-to-jet-test-flight-2012-07-03
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