1931 Bugatti Type 41 Royale by Kellner  – $9,654,000
The Bugatti Type 41 Royale is the largest production car ever built. The 1976 Cadillac Fleetwood, what most people think of when they think longest car, had a wheelbase of 157.5 inches. The Royale? 169 inches. At 236 inches long, the Bugatti is in fact 3 inches longer than the Caddy, however it weighs 3,000 pounds more, for an Excursion like total of 7,500 lbs.