Montgomery makes high-end vodka, gin, and rye whiskey, but every distiller, even a moonshiner, throws out the stuff that comes out first. “Things like methanol and ethyl acetate—basically nail polish remover—you obviously don’t want in your finished drinkable product.” The nasty brew is sent through a condenser and turned back into a liquid. In distilling parlance, the result is called “the heads,” which are generally discarded, but not by Montgomery. “They’re highly combustible, perfect to run an engine,” he says. And just like that, an idea was born.