I bought Cultus VXR a week ago and changed the tires 3 days ago.
I upgraded to Continental tires - ContiEco Contact 3 --- 175/65 R14
Excellent Road Grip - Almost soundless - Better fuel economy than stock tires, even though its little wider.
With stock tires I was getting an avg of 17.2 within city. Now getting 17.6/7 
Having air pressure 35 PSI in all 4 tires.