I honestly don't know. The speedo cable in the Miada broke, and it's not a priority to get it fixed. but according to my tach, and some rough calculations, about 135 on the back straight at VIR.
ferrari 360, 550, maserati spider, coupe, and quatroporte. my fathers 50th anniversary vette. all been driven by me. never got to take the ferraris above 60 though =[. the maserati i did 125 in on a back road by my house. and the quatro my father drove me in. and the vette a solid 150 on the entrance ramp to the highway.
My friend had a 2003 Ford Lightning that we took to 146 (governer limited). That was pretty insane since I was driving that speed in a truck. Then his G35 to about 140, then in the pro was 132...but i was going downhill and probably had some backwind.
Fastest car I've ever driven was a 1985 Porsche 928. I only took it to 100mph, though. Very stable and comfortable car. I think top speed on that was 168mph.
Fastest I've ever gone is 129 mph in a 1984 944. Toppped it out in 1992. Not bad that it was only 2mph under it's listed top speed 8 years later. It was also surprisingly stable, although I could feel some lift under certain road undulations. Don't worry, it was on a deserted highway at 2am and I prompty slowed back down after holding that speed for about 15 seconds.
125 in my sisters 00 stratus (haha, weakassweak), and 130 or so in my dads new GS300...my buddies modded WRX was the most fun,but it wasnt on the highway so i only did about 70 or 80 (got there real quick tho)