What i read from indian website and user reviews, it gives 14-15 km/l with ac within city jammed packed traffic and traffic situation in big Indian cities are lot worse then Pakistan's, I see following written on indian website
This high powerful engine of Maruti Wagon R is very fuel efficient and the manual gearbox ensures good performance and offers an impressive mileage of 14.2kmpl in the city and 18.9kmpl on the highway
Here is the link, you can read user reviews, scroll down and click User Reviews