Search for "rust" in thread titles ("advanced" search box, top right corner of every page).
A few members have had rust issues: With the underside of the rocker panel (due to sandblasting/gravel blasting). Also some complain about paint chips rusting. Several people have had the hatchback handle rust, and there's a recent thread about the reverse camera housing rusting.
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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) ...