Thank you Yasirshafeeq,
Yokohama 195/70/R15 is the least (F) fuel efficient class as well.
I was also considering 195/65/R15 (635/25") as it will give 1.8' ground clearance. And 215/55R16 (643/25.3") ground clearance of 2.15".
Although 185/70/R14 will give me same ground clearance as of Cultus. But in Karachi I will have to visit rocky areas (once road was there) occasionally in that if I visit in Cultus touches the ground.
What is your opinion?
And could you please tell me, whether I would be required to change OEM RIMs as well if I chose above two options?