Leilani Münter has a motto: never underestimate a vegan hippy chick with a racing car. She is a fierce environmental activist – who earns a living in one of the most gas-guzzling industries on the planet. But the 42-year-old, a Nascar racing driver, insists she isn’t the walking contradiction you might imagine. She’s a pragmatist. “I am making the biggest difference when I am at a race track and not when I am at an…