This is in regards to your query posted on the website CarDekho.com, we would like to inform you that there is no deal in Kanpur for Nissan, you can opt to purchase the car from Gurgoan or Bhubaneshwar. You can use the given link to view available Nissan Dealers in India. You can use the given to view indicative Nissan Micra On-Road Price.
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.