By Mark Hanrahan LONDON (Reuters) - Alcohol and automobiles famously do not mix - but one Scottish scientist has disproved that maxim by driving a car powered by biofuel derived from making whisky. Edinburgh-based Celtic Renewables has developed a process to manufacture the biofuel biobutanol from draff and pot ale - barley kernels and a yeasty liquid that are produced when whisky is made and then usually thrown away. Martin Tangney, the president of Celtic Renewables and director of Edinburgh Napier University's Biofuel Research Centre, said that a desire to effectively manage resources had inspired him to pursue the project.