Hi astroz0mbies,
I have had my Micra a year and 3 months, very low milage car not quite to 9000km yet. Up until last week i always filled up with premium. There have been a few heated debates here on the forum on the premium/regular question and after looking on line at a bunch more info, debates and technical discussions, i have decide to try running regular gas to see if there is any difference i can notice with regards to mileage or performance.
I am at a little over half a tank and so far no noticable difference anywhere (except the price).