https://www.koenigsegg.com/koenigseg...speed-records/

"A Koenigsegg Agera RS driven by factory driver, Niklas Lilja, achieved five new world records for a production vehicle on November 4th, 2017, in Pahrump, Nevada:
THE HIGHEST TOP SPEED FOR A PRODUCTION VEHICLE

Calculated using an average of two runs, one in either direction. The record speed achieved is 447.19 km/h (277.87 mph)"