A full size is a Crown Victoria or the late, great Chevrolet Caprice.

The Impala (nee Lumina) and Grand Prix were called mid-sized back when Chevrolet made Caprices and Bonnevilles. The Taurus has always been Ford's mid-size, below the LTD/Crown Victoria line.


Over the years, ERAC (and other rental companies) has begun calling mid-size lines full-sized. Now, they are even calling Japanese vehicles like the Honda Accord and Nissan Altima full sized. These imports may be bigger than they were before, but they are nowhere near the size of the old bench-seat, column shift widebodies of yore.