If they follow you in another car, they'll probably follow you in another Nissan Micra. They know what's up.
In any case, I put "Versa"-sized tires on my car (185/65R15), and using a Garmin GPS, have determined that my speed at 120 km/h is over by a respectable 2-3 km/h. This tells me two things: 1) The Micra components for measuring speed likely came straight off the Versa assembly line, and 2) it's a problem they'll likely fix by up-sizing the tires, but only when they're forced to.
At the very least, Nissan should release a bulletin stating that the 185/65R15 are suitable to be used on the Micra, because I had to lie to the tire shop when I brought in my old tires and rims and told them it was for my Versa. I am a man of principle, and therefore feel no guilt in lying in this case.
In our culture obsessed with absurd excess, the Nissan Micra is my counterculture car of choice.
Be sure to visit my blog at mymicra.com
View my fuel log 2015 Micra SV manual: 6.4 L/100 km ... 44.3 mpg (Imp) ... 15.7 km/L ... 36.9 mpg (US) ...