I was on the "Greenway" here in the Orlando area a few years back in my 93 Dodge Dakota V8. I was doing around 85 or 90, when I see this car coming strong in my rear view. Was late at night (was only car on the road), the headlights looked like a cop so I started to get worried..... then it zoomed by me, and I noticed it was an Impala SS (newer one with LT1 engine), and I gunned it. I got to my speed limiter of about 110 on the speedo, and the Impala must have been doing a good 20 or more faster than me as it just left me in the dust heh =)
Fastest I've been as a passenger is like 130-135 in my friend's 92 Trans Am Covertible (top up).