"A biochemist in Scotland recently founded a company to piggyback biofuel production off the whisky distillation process. Martin Tangney, the founder of Celtic Renewables Ltd., hopes to turn ... waste into a feedstock for the production of biobutanol — an alcohol similar to ethanol, the most widely used biofuel. But it packs a considerably larger energy punch on a pound-for-pound basis — almost as much as traditional gasoline — and current combustion engine technology can take biobutanol at virtually any fuel mix. Biobutanol’s also much more amenable to pipeline transportation, an option that isn’t available for ethanol." (Quoted from article)