As per your query posted on our website CarDekho.com for Nissan Micra.
Micra diesel gives a mileage of 18.5 in city & 23.08 on highways.
Nissan is having dealers nearly every where and is expanding rapidly.
Yes it comes in Steel Grey Exterior.
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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/