The Hennessey Venom GT is the fastest road car in the world, setting a mark of 270.49mph early in 2014. It beat the previous title holder, the Bugatti Veyron Super Sport, by just 0.63mph - but the record won't be officially recorded. 
Hennessey took its car to the Kennedy Space Center in Florida, USA to run the car on NASA's 3.2-mile Space Shuttle landing runway.
The official Guinness World Record requires two runs in opposite directions to work out an average speed - meaning tailwinds are taken into account - and since the Venom GT wasn't able to do this on that runway, the record books remain unchanged - the Bugatti is still technically the champion.
Also Read: Bugatti Veyron--World's Costliest Car
“The Venom GT attained a maximum speed of 270.49 mph as measured by our VBOX 3i GPS system,” said Racelogic engineer Joe Lachovsky - independently verifying the speed that was reached.
The Venom GT also holds the speed records for world’s fastest car from 0-300 km/h (13.63 seconds) and 0-200 mph (14.51 seconds). That's thanks to a low weight (1,244kg) and a high power output (1,244bhp) from its 7.0-litre twin-turbo V8 engine.
