personal highs for me:
1978 240D - 93mph downhill with the wind blowin from behind!
1983 300CD - 110mph on I-70
1987 300D - 105mph on I-81 ? to tennessee with 4 people, full drumset, 3 guitars and 3 amps IN the car
2004 S600 BiTurbo - 140mph, but hey, they complained the car had poor acceleration, i HAD to test it out

seemed fine to me!