Thank you very much. Yes, MA SHA ALLAH, it truly is and I will try to keep this figure maintained (or as nearest as possible) IN SHA ALLAH.
I believe the CAT is perfectly fine right now; have been driving this for just past 02 weeks, and no need to do any sort of "Chaaeer Chaar" with Catalytic Converter for at least 10-15,000 Kms, or until / unless, I start feeling drop in pick, power / performance and fuel efficiency of car.
Regarding OEM tire size and MPG, you are right. Currently, I am using stock tires and OEM tire size 165/70/R14, the tires which came with car from Japan, however, I plan on up-sizing, so as to resolve ground clearance issue once and for all (as pro-active approach).
I am thinking to go for 185/70/R15, without spacer springs, packing, etc. No doubt, suspension will get slightly compromised along with fuel efficiency, but to cater for ground clearance, I think, I will have to go for it