Sorry Sir, your car has failed the breathalyser!

A couple of years ago I posted about a Scottish distillery which had come up with a way of turning their waste product into methane gas, which could then be used to power their machinery.  Now we have a story of another distillery up there which has entered into a partnership to convert their useless byproducts into butanol, which can be used to fuel cars.  What struck me most forcibly is that apparently 90%  of what a distillery produces is of no use and normally thrown away.  What a waste!