The record was set Saturday on a closed 11-mile stretch of Nevada State Road 160 outside Las Vegas.
The video [embedded above] shows how the Koenigsegg Agera RS achieved an average speed of 277.9 miles per hour (447.0 km/h) while in a single run it achieved 284.2 m/h (457.37 km/h). Over the weekend, a Koenigsegg Agera RS piloted by test driver Niklas Lilja clocked an average speed of 277.9mph on two runs, making it the fastest production vehicle in the world.
On its first run the Koenigsegg registered a top speed of 271.2mph, beating the Veyron even while battling an incline and oncoming winds.
The French carmaker originally set the record for a test they invented in just 42 secs, adds the newspaper, but this was quickly beaten by the Koenigsegg Agera RS's time of 36 secs.
On the reverse run, the Koenigsegg was clocked at 271mph, so the average top speed was 277.9mph.
That record had been held by a Hennessey Venom GT which was recorded at 270.5mph in 2014. The Koenigsegg reportedly ran standard Michelin Pilot Cup 2s.
The project was launched almost a decade ago in 2008, and as part of its preparations it will attempt to break the current world land speed record of 763mph in 2019.
"Koenigsegg has capability to made Agera RS about 15 sets one year, " Patrick Wang told Xinhua Sunday, "There are about 60 to 70 sets all in the world, every one costs about 5 million dollars".
Forget the Bugatti Veyron, the record for the fastest production auto has been smashed yet again.