The last Ford Crown Victoria rolled off a Canadian assembly line Thursday, marking the end of the big, heavy Ford cars that have been popular with taxi fleets and police departments for decades. Since 1979, almost 10 million Crown Victoria, Mercury Grand Marquis and Lincoln Town Cars — so-called Panther Platform vehicles — have been sold. Demand for better fuel economy and performance has choked off sales over the years. The Crown Victoria and Town Car get just 24 miles per gallon on the highway, a figure matched by some large three-row SUVs today. … The Crown Victoria and its...