Wo us time k hesab k lia thek tha. but onces i have drive this suzuki every 660cc mini van, it comes with 3 auto forward gears, and at 60km/hr in third gear i was feeling that the car was asking badly for the next gear.
Wont say its a wise decision, or experiemtn that with your car, which will end up wasting time and money. If you want to drive your car below 40km/hr on highways or local then i guess its ok. traffic is not an issue in only karachi. its an issue in almost every city.
TBH, you can get opinion from some who has this engine with auto transmission. He will tell you the reality.