Cruising: 15-25 over the posted limit usually, depending on the location of my radar detector.
Town: 0-15 over the posted limit, depending on how residential the area is.
Top speed: 120 MPH.
Top speed pulled over at: 112 in a 55. The world's nicest officer then wrote me up for 85.
If I didn't have an underpowered convertible, I'd get into real trouble.