A one-off Bugatti Veyron Super Sport Pur Blanc managed to hit 246.6 mph (396.8 km/h) on a closed public road.

A one-off Bugatti Veyron Super Sport Pur Blanc managed to hit 246.6 mph (396.8 km/h) on a closed public road.

Over the years, Bugatti launched numerous one-off versions of the Veyron including this Pur Blanc based on the Super Sport variant. The owner took it to this year's Sun Valley Road Rally organized in Ketchum, Idaho where he had the opportunity to really test the supercar's power rated at a jaw-dropping 1,200 PS (883 kW) and 1,500 Nm (1,106 lb-ft) coming out of the familiar quad-turbo W16 8.0-liter engine.

As a reminder, Bugatti introduced a Veyron Super Sport World Record Edition electronically-capped at 258 mph (415 km/h) but an unrestricted car was tested back in 2010 when it reached 268 mph (431 km/h).

Despite these astonishing numbers, Bugatti is having a very rough time selling the remaining units part of a 450-car production run which began in 2005. They had to resort to a ludicrous number of special editions to move the rest of the units off the lot. A new model will be out towards the end of 2015 or early 2016 and has been described by VW Group's design chief Walter de Silva as "more than" just a Veyron replacement. Hopefully the new model will prove to be a much better business case than the Veyron which is allegedly costing the Volkswagen Group a staggering 6.27M USD loss for each car.

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