Toyota's hybrid Prius family has grown to four models, including the plug-in, the roomier "V" and the economical "C." Sales nearly tripled in May to 21,477. Neither Ford, nor any other manufacturer, has a comparable high-tech brand. Skepticism was high when Prius was launched more than a decade ago, but now it outsells Buick, Acura -- and Lincoln -- on its own.
NEXT: 5. Trucks: A mixed blessing for Ford
