Good theory! I did a bit of digging... and... that's not the case.the manual is probably pulled directly from the Euro Micra
Even the lowest powered 1.2L UK Micra has taller gearing (lower RPM) than ours. The good news is if you really wanted to lower your RPM for better economy, you could do it with parts from a UK gearbox.
We have a Micra gearing thread already, so I updated it with a chart comparing transmissions: Gear ratios: 2015 Nissan Micra transmission, 5-speed & automatic (speed vs RPM)
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View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...