I have seen 145km/h while sitting on second seat of my friend's Mehran on M2.
But but but believe it or not...
same Mehran crossed us while we were on Alto at speed of 145km/h on another occasion.
He said it was full meter 150/kmph. They laughed at our Poor alto which can't reach compete it despite having 1000 cc engine.
Moreover, that guy crossed us with horrible way once from right side and then after lowering speed from left side ... pooray cut mar kay.
And guys are saying that it goes out of control
It's all about driving skills.
Ps. I personally don't go above 120kmph on mehran because It gets bit out of control.