Another alcohol, butanol, is a much better renewable fuel, says the president of BP Biofuels. Alternative fuels such as ethanol could help reduce carbon-dioxide emissions and decrease oil imports, but so far these biofuels only make up a small fraction of fuel use. One of the biggest challenges to ramping up ethanol use is distributing it. That's because ethanol can't be transported in the same pipelines used to distribute gasoline. What's more, ethanol delivers far less energy than gasoline does on a gallon-for-gallon basis. Philip New, president of BP Biofuels, a recently created company within the giant British oil producer,...