This is in regards to your query posted on the website CarDekh.com, we would like to inform you that Nissan Micra is available in both diesel and petrol options. The Petrol variant of this car is powered by 1.2 liter petrol engine, it gives mileage of 14.0 kmpl in city conditions and 18.0 kmpl on highways. Nissan Micra Diesel is powered by 1461 cc diesel engine, it gives mileage of 18.5 kmpl in city conditions and 23.08 kmpl on highways.
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.