This is what I found on Wilipedia:
Biosynthesis of Isobutanol
Higher-chain alcohols have energy densities close to gasoline, are not as volatile or corrosive as ethanol, and do not readily absorb water. Furthermore, branched-chain alcohols, such as isobutanol, have higher-octane numbers, resulting in less knocking in engines. Although produced naturally during the fermentation of carbohydrates and may also be a byproduct of the decay process of organic matter, Isobutanol or C5 alcohols have never been produced from a renewable source with yields high enough to make them viable as a gasoline substitute before the 2008.The small motor manufacturing organizations have been asking for this as a substitute for Ethanol for several years. The EPA and certain political elected office holders seem to be motivated by the size of the donations rather than science, economics, of free market.
Strange as it sounds the EPA has impacted the "hybrid" market in the US for diesel electric boat by several hurdles that are not present in the EU and likely will prevent growth in the US larger boat market.
Mike Electric Yacht Pacific
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Posted by: mike@electricyachtssocal.com
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