Recently tried out a standing start on private land, not quite flat, so figures are slightly flattering. Given the car is 10 years old (Oct 06) and has 160,000 miles on the clock, I am pretty happy it still works as intended.
Not sure about the calibration of HP, I certainly don't have nearly 600BHP.
Ian (IT), would love to have seen a similar trace for your RS6.
Richardracer
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2006 Audi S8 V10 Now Sold.

Akoya Silver with black/grey leather, standard 20" wheels, hybrid TV, Bang & Olufssen audio, Heated seats front and rear, Dension ipod integration, DAB radio, keyless entry, rear electric blind, bluetooth connection to Apple iphone6S. Started at 60,000 miles end April 12. Now 171,500 miles as at Oct 2017. Now sold to fellow forum member.