I'm having problem with top speed on motorway. For a month or so, it is barely crossing 105 km/hr on motorway (on flat road). Recently i had changed the brake pads. Nevertheless, the acceleration is still fine as before, and i don't feel any problem on normal roads touching 90's quickly. Got it checked from a mechanic in Walton (Lahore) and he cleaned throtle body, changed spark plugs (had done 20k) and changed the fuel filter as well. As before, the result was fine on city roads; but as i went from Lahore to Pindi on the motorway, again it was hardly crossing 100 km/hr.
I'm driving on petrol; no CNG installed yet.
Any opinions ?