130 MPH, back in the day. I regularly use to do a ton and ten on motorways, that was a cruising speed for a lot of drivers. You can't do that speed anymore and expect to keep your license, certainly in the UK, but you wouldn't want to with the congestion.

Here in the Netherlands, you can do 130 KPH on some of the motorways, but you won't get much opportunity to push-it above this.

I don't think there's much joy left in driving these days, the romance of the road seems dead to me.

165+

I remember testing a Honda Fireblade once, I'm sure it was on the autobahn, or maybe a closed airfield . But it had a digital speedo which was a fairly new things for bikes then, I gave it some right hand and went up through the box, after a few seconds I felt as though the bike was shifting a bit so I glanced down and was surprised to see 172 at which point I backed off in a hurry! It was quite shocking really as the bike felt rock steady and sorted at that speed, there was no feeling that it was under any strain and was still accellerating steadily. It did feel like that bit in Star Trek when they go into warp drive, I think I actually moved into the future and gained two or three seconds 

I've still got quite a fast bike in the garage but I rarely exceed 60 - 70 mph now - for exactly the reasons cited by Hepcat.