http://www.forbesautos.com/advice/toptens/billionaire/05-ingvar_kamprad.html
Ikea founder Ingvar Kamprad (6th richest person in the world) apparently drives a 13-year-old Volvo (well, so he says)—and this when he’s not taking the bus. (There’s links to the (surprisingly humble) rides of other rich people from this page.)