Mehran's speedometer (like most other vehicles) show about 10% more speed than you are actually travelling, (especially on stock tires). so, to be sure, it would be a good idea to check the speed with GPS (which is present in most smartphones).
secondly, I would agree with all the experienced members here that driving mehran at 100 kmph could be extremely dangerous as it's not stable at high speeds at all. especially the recent models from pak-suzuki in which they have raised it's ground clearance beyond what it's chaises is designed by Suzuki engineering.
This last saturday, my colleague who sits next to me was travelling to faisalabad via motorway, and had to take a sharp turn at ~90kmph and his car rolled over and then kept rolling. Luckily he stayed on the motorway and did not hit anything. he only suffered minor injuries because of pieces of broken glass. and was able to walk away. but his car is almost totaled.
Actually he dozed off a bit and realized that he was heading towards fields, he tried to correct his direction when he was on rough shoulder, and lost control of the car. but the point is, that the car flipped over without actually hitting anything