Nissan Micra is available with 1.2L, 1198cc engine displacement with 5 speed manual transmission gearbox that offers mileage around 14kmpl in city and 18.6kmpl on highway.
Please mention the city where you want to buy this car as prices varies across cities. However I am providing you the details as per the ex-showroom New Delhi.
Currently Nissan Micra is available with three variants - XE (the base variant), XL (mid) and XV (the top end) which are priced as below given price list.
Nissan Micra XE - Rs 3.98 lacs (ex showroom Delhi) - Rs 4.28 lacs (on road Price in Delhi)
Nissan Micra Xl - Rs 4.28 lacs (ex showroom Delhi) - Rs 4.74 lacs (on road Price in Delhi)
Nissan Micra XV - Rs 4.69 lacs (ex showroom Delhi) - Rs 5.19 lacs (on road Price in Delhi)
For more details of the car along with its ex showroom and on road prices in your city you may visit the given link of Micra.
You may also check the other cars of same segment like Maruti Swift, Maruti Ritz, Ford Figo and Volkswagen Polo. For detailed information about these cars you may visit the given links of these cars. Comparison between these cars is available at below given link.
Petrol Cars Compare Nissan Micra Maruti Swift, Ford Figo and Volkswagen Polo
Diesel Cars Compare Maruti Swift, Maruti Ritz Ford Figo and Volkswagen Polo
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.