LENO: "I think the way to handle it is the way they did it with smoking. You make it socially unacceptable. You reward people by giving them a rebate. Government mandates ... I don't know. I find with Americans, when you mandate us and tell us you have to do this, well, they'll fight you tooth and nail. When you tell the automakers they have to increase fuel mileage they will take you to court and fight you for 10 years. When you make it socially unacceptable, when Hollywood stars and athletes and everyone goes, 'I like this little car,' the marketing changes the next day. So to me, I think it can all be public pressure.