^ You're a rare person who preferred the Mirage after test-driving the Micra! The power/handling/refinement differences (talking 2014/15 Mirage) are pretty big. You've really got to be motivated by fuel economy/warranty to choose the Mitsu.
However, getting back on topic..
Changing the spark plugs on the Micra or Versa/Note HR16DE is a complicated, multi-hour procedure that requires removing the intake plenum, throttle body, and even the front bumper (to make it easy to get the plenum out easily due to clearance issues with the hood latch assembly).
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)