Hi Vishnu,
Okay, thanks for the clarification
. Actually in our region, 155/R15 tires are bit difficult to get since most of the brands dont have this size.
OMG, you are the first person I see who getting poor mileage with XM2.
Odometer re-calibration according to the upgraded tire is little difficult/tricky task. Only an expert person can do it accurately. Any idea about how he did?
My stock tire size is 155/80/13 JK and upgraded to 175/70/13 XM2. I never had any noticeable reduction in mileage even thought the upgrade is from 155 to 175.
I believe your stock tire size is 145/65/13. So there is an increase of 2.5%.
My suggestions are
*Increase the psi of your tires. XM2 are really soft tires. You will get better pose by increasing 2-3psi more than the recommended tire pressure.
*Compare your odometer reading with another car's/bike's odometer for the same distance of drive and see whether it has any difference or not.
Regards.,