From – Biobutanol better than ethanol? describes a new biofuel from Dupont and BP called biobutanol that sounds very promising. According to the article, biobutanol provides 95% of the energy of gasoline compared to 75% for ethanol. Conventional gasoline engines can use more biobutanol without modifications than the 5-10% blend that is the limit for ethanol. Right now, production of biobutanol is more difficult and expensive to produce than ethanol, but research is underway to solve some of these production issues.

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