But I am using 175 70 13 from very first day , milage is good , got 21.2 while traveling out of city with ac . RPM 3 . What else you want man ??? The road grip is as good as you can think . Check my previous posts , see the full meter pics @180 KM/HR . 
[QUOTE=pakwheelsimb;4858875]Go through the thread its already discussed in detail. Best tier size is 165/70/R13 in any brand with ecos eco ecopedia ot touring.
If u have android phone then install app tier size.
Don't go for 165/65/R13 it will spoil the mileage. Do share detail pics of ur tiers.[/QUOTE