Most Expensive Car in the World : Bugatti Veyron

The Bugatti Veyron is a mid-engined grand touring car which sells for $2.4 million, making it the world’s most expensive car. The Super Sport version is the fastest road-legal production car in the world, with these specifications:
Top speed: 431 km/h (268 mph), Gearbox: 7 Gear DSG, fuel consumption combined: 23.1l/100km, fuel consumption in town: 37.2l/100km, fuel consumption out of town: 14.9l/100km, CO2 emission combined: 539g/km.

Website