4. Mercedes-Maybach Exelero
Price: $8 Million
Like many others before that, the Mercedes-Benz Maybach Exelero is a one-off. Commissioned by Fulda, a German subsidiary of Goodyear, to test its new tires, Exlero made its debut in 2004. Mercedes built the Exelero on the bones of the Maybach and gave it the same twin-turbo V12 engine producing 690 horsepower (510 kilowatts) and 752 pound-feet (1,020 Newton-metres) of torque. The top speed is 218 miles per hour (350 kilometers per hour) and adjusted for inflation, the Exelero would have cost more than $10 million in today’s money.