Times are certainly changing. When the original Toyota Prius appeared in 1997 (albeit a bit later in the U.S.), it was the first mass-produced hybrid vehicle in the world. Today, the Prius family is made up of several members: the third-generation Toyota Prius, the Toyota Prius v extended hatchback, the thrifty, subcompact Toyota Prius c, which will launch soon, and the newest Prius plug-in, which also premieres (at select dealerships) this spring. In a…