Know what else I'd consider doing out of sheer curiosity (I probably would have already done this, but there's no local Nissan dealer in my little city)...
I'd go try out a Versa sedan or Versa Note (5MT). Same drivetrain that the Micra will have, in a slightly heavier package. Different handling dynamics too, of course. Just do it for the engine/trans experience.
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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) ...