In my experience, cultus, mehran speedo meter always show a bit higher speed ( 10 to 15 km ) higher the speed higher the error. So if meter is showing 175, it does not mean it was 175. Best way to be sure about speed is to use GPS.
There are parts on motorway where my 14 year old khyber likes to go beyond 150, not because of its power.. but because of gravity :).
And yet there are places on motorway where it would not go beyond 100.
So it all depends on the patch you are driving. Speed is not a true measure of power.