Once upon a time, the family sedan was a staple of American roadways. The kids were shuttled to school in four-door Chevrolets and Toyotas, while hardworking folks everywhere dreamed of the day they'd move up to a BMW 3 Series, a Mercedes E-Class or an Audi A6. And when car companies talked about their "flagship" offerings, that usually meant something like a Lexus LS.
