@ahmadz_1: for the moment, no. The reason is that Alto is running fine, there is a fair amount of road grip, I think this tyre size is helping with the fuel economy, the car does not feel heavy, steering is light; it's basically a smooth and economical ride. My hinderance is that 165/70 might improve the road-grip but it will make the car heavier to drive. So, not at the moment.