@Waqas34...You are right, I also drive my friend's Baleno on motorway and way faster then my one and didnt face any problem. Dont know whats the problem with mine one? Actually mechanics also dont know too much and this problem one can feel only on motorway when driving above 110 , 120. I think as u said also, there is some problem with steering.
@KHAHSAN....U r right, tyres can be the reason but I am using Dunlop as you also suggested, its only 6 months old.
@Skill....drive safe
@Huzaifaa....Drive safely Baleno can easily touch 160-165 on CNG. And regarding comparison I also prefer Baleno over Corolla. both are same category cars but corolla has better market rate.