Reuters: Scientists in Scotland have unveiled a new biofuel made from whisky by-products that they say can power ordinary cars more efficiently than ethanol. A research team from Edinburgh’s Napier University spent two years creating the biofuel butanol that can be used in gas tanks either as a stand-alone fuel or blended with petrol or diesel, they announced this week. It is derived from distillation by-products pot ale (liquid from copper stills) and draff (the spent …