I will give you an honest answer to this. I have my experience with this car myself and with discussions with other people who have this car as well as suzuki dealership officials. If fuel economy is your priority this is not the car for you.
The car might have good stability and interior but the local swift is not good on fuel economy. Some people may quote hybrid like mileages but keep in fact the PKDM swift is new only in Pakistan. It's based on a 2004 engine technology and the PKDM M13A lacks VVT which was available in JDM swift. Paksuzuki has not only provided an older shape but didn't even bother to upgrade the engine.
Even if you read international reviews of the car on the internet it is not popular in the fuel economy department. I have the official spec sheet with me which was available on globalsuzuki.com website when this car was being sold in other countries. Even the official rated Fuel Economy of the car in Urban/City is around only 13kmpl. Take into account the traffic, Air conditioning, etc and the figure goes further down.