The delivery of any car depends on the location of the city, available colours, variants etc. If you are going to buy Nissan Micra in Pune but before buy it, conform your expected variant and colour.
For contact information of Nissan Car dealers in Pune you can click on the given link.
We encounter similar question many times, the easiest way to increase the mileage is to keep your car healthy. Keep the tyre pressure proper, air filter clean, always follow speed limits and turn off your engine on traffic lights. Find more tricks here- Please find the details Chevrolet service centers here- http://forum.cardekho.com/topic/356-how-to-increase-mileage-of-your-car-tips/
There is not any special petrol recommended for NIssan Micra. You can use simple unleaded petrol in it. However, you can use Speed, Power or Extra premium petrol for better performance of the vehicle.