Below are fuel economy reports from Micra 1.6L drivers gathered from around the web.

Update, June '14: some new threads with reports from forum members/owners driving the 2015 Micra...




Here are a number of owner reports from Brazil and Europe found on YouTube and other sources.

(Interestingly, the 1.6 only comes with the 5-speed manual transmission in Brazil -- http://www.nissan.com.br/#carros%2Fmarch)

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L/100 km MPG (US) MPG (Imperial) Trans. Notes Source
5.2 45 55 5MT Highway driving: 338 km on the trip odometer. March owner Fabiano Martins de Almeida from Brazil. Youtube
5.9 40 48 5MT Highway driving: 339 km. "Between the cities of Arapoti Maringá-PR-PR. Air conditioning on." Same owner as above. YouTube
6.0 40 48 5MT Highway driving: "The car is very economical, in 1900 km made ​​on a trip he made an average of 16.8 km/L". Youtube user Edson Edu. Looks like he cruises at just over 100 kph.

A commenter says he has 31k km on his March with exactly the same average.
YouTube
6.3 37 45 5MT City driving: "nissan march 1.6 after 234 km run in the city, with little use of air conditioning." YouTube user ju85fulness. YouTube