I would suggest you Honda City 2011 - 2013 Model,
you'll get an average size engine of 1300cc, it doesn't have a big maintanance cost also. At each maintanance interval expect to spend atleast 10,000/-.
You can expect an average of atleast 10.5km/l with AC.
You can get it in range of 15.5 easily, 15 would be a really good demand if car is original or having 1 or 2 touch ups and have been maintained from Honda.