Some numbers on the cars performance that day.
Speed vs. time and distance vs. time
Speed vs. Distance and mph intervals.
I will bring some more soon, but I don't have anything over 250 kph.
The cars did 50 to max speed, that was 218 for the RS4 biturbo Avant and 250 for the other two. I didn't measure over 250 kph.
Audi RS4 biturbo Avant (not ok this day) 50-218 kph = 26,87 s
M5 E60 Kellener 50-250 kph = 20,51 s
CGT 50-250 kph = 17,99 s
Remember that the two later cars did have som problems in the start with traction or bogging engine that affected the runs even over 50 kph. The M5 did some very long dual "liquorice" on the pavement, continuing even in third gear. So with some exercise it is possible to cut these times a bit.
KTL