Update, Apr 15: Here are the Micra's fuel economy ratings, published by Nissan. (Close to what our digging predicted.)

Transmission City Highway Combined *
5-speed manual 8.6 L/100 km
33 mpg (Imp.)
27.4 mpg (US)		 6.6
43
36		 7.7
36.7
30.6
4-speed automatic 8.8 L/100 km
32 mpg (Imp.)
26.7 mpg (US)		 6.6
43
36		 7.8
36.2
30.2
* Combined = 55% city, 45% highway

Real world mileage reports from Micra drivers ...

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2015 Micra fuel economy/mileage test: ecodriving a 5-speed and automatic in Montreal

We show how the Micra can get surprisingly good fuel economy when driven carefully in the city & on the highway.
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Micra automatic or manual: which should you get for best gas mileage/fuel economy?

The manual and automatic may have similar ratings, but there's one clear choice if your goal is best efficiency.
Name: thumb3.jpg Views: 33484 Size: 3.5 KB Micra 1.6 real world fuel economy / mileage reports

Fuel economy reports from real world drivers of the Micra's 1.6L engine		 Name: head-to-head-sm.jpg Views: 17257 Size: 2.8 KB Head to head: Micra manual vs. automatic MPG/fuel economy comparison

Comparing 2 Micras driven at the same time over the same route.
Name: thumb4.jpg Views: 21656 Size: 2.4 KB Video: 2015 Micra Multi Information Display (MID) fuel economy, odo, fuel gauge, etc.

A look at the Micra's factory LCD display that shows average & "instant" fuel economy/mileage, and other info.