Got a car? Go buy the latest issue of What Car. No, not because I work for its publisher, Haymarket, but because it has a frankly brilliant Going Green supplement this month. It's a really fact-packed and pithy mini mag, with everything from the obvious - eco-friendly cars, including the Lexus R400h I've reviewed - to tips on how to drive greener and save cash. There's a link to some preview content after the jump.