What is the difference between PNG and LPG ?  

LPG is Liquefied Petroleum Gas and PNG is Piped Natural Gas. LPG is supplied in liquid form just as the name suggests in cylinders whereas PNG is supplied through a pipeline. LPG is used as a fuel in heating appliances and vehicles, where as PNG is used for cooking (gas stoves) and heating water (gas geysers).

Is PNG (Piped Natural Gas) more advantageous as compared to LPG (Liquefied Petroleum Gas) ?  
How can I avail the PNG Gas supply ?  
Do I need to make any changes to my gas stove for using PNG gas ? 
What do I have to do with my LPG cylinder once I get the PNG onnection ? 
How, when and where should my gas bill be paid ? 
Is it possible to make any changes in my gas line, if required ? 
Can I get more than one point for PNG ? 
Can I get the connection, if I live in a rented house ? 
What do I need to provide to get a PNG Gas connection ? 
In case I notice any leakage in the line, what should I do ?