If you want to compare japanese 660cc car, compare them with mehran or Alto. Bodywise, comfortwise, drivewise, Spacewise they are far far far far far better than mehran and alto.
Now in terms of how they are on pocket, remember you have to pay for better stuff always. Consumption wise 660cc car on petrol is like approx 1300cc car on cng. It gives 12 to 16km/l on petrol inside the city and much better on highways about 20km/l.
you can check mine here
Because its 660cc, it will go upto 100km/h to 110km/h easily but above that it will be slightly harsh on the car although the meter says 140km/h. Regarding hilly areas if bolan can go up there on cng then it will surely do as well.