The test was carried out on an 11-mile stretch of road between Las Vegas and Pahrhump, that had been closed to the public.
The small Swedish automaker's Agera RS supercar has claimed the title of World's Fastest Production Car at 277.9 miles per hour. Michelin is working on a tyre capable of withstanding the forces that would be generated when the 1,479bhp, 1996kg vehicle approached the 300mph barrier and, if it's successful, we could see more production auto world speed record fireworks in the near future. Towards the end of the second run, the Agera RS even surpasses 450 km/h - close to the speed of a small aircraft.
That in itself was enough to beat the previous highest recorded top speed of 270.5mph, by a Hennessey Venom GT in 2014. Previously, it was reported that the Koenigsegg Agera RS blocked record Bugatti Chiron for acceleration up to 400 km/h and further stop.
To hit these incredible speeds, the Agera RS is built using a lightweight carbon fiber body and an aluminum honeycomb monocoque structure. The numbers were recorded by Racelogic with the VBOX HD2. The uphill gradient and strong headwinds Lilja faced makes the runs all the more impressive.More news: Trump previews 'major discussions' with Japan on North Korea, trade
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The Texan firm shouldn't have much to worry about if their previous performance claims hold merit, as the Venom F5 is projected to crack 301mph (484kmh).
Allowing the Agera RS to reach such a ludicrous speed is a 5.0-litre twin-turbocharged V8 produced in-house by Koenigsegg, pumping out 1380bhp and 1280 Nm of torque.
Sure, the V10 Italian exotic may only have half the power of an Agera RS with the Megawatt engine, but the Sant'Agata Bolognese machine has something that the Swede is missing, namely a naturally aspirated heart.