Hennessey Venom GT. During the start of 2004, this car achieved a top speed of 270.49 mph, which is equal to 400 feet per second. The previous world record was Bugatti Veyron super sport, with a speed of 269 mph. Test pilot, Brian Smith, believes that he could get another 5-10 mph with the Venom GT, but the Rome way in Florida was only 3.22 miles long. The Texan manufacturer was given access to Nasa's space shuttle landing runway in Florida for one-off blitz in the 1200bhp machine. However, the fastest, non production car is the rocket powered Thrust SSC. It broke the sound barrier in 1997 after achieving a speed of 763 mph.