the average miles put on a car per year is actually ranged between 12,000-14,000 miles a year. However, if there is more then that you may have to take into considerations its previous owner(s) job as far as commuting and vacations went.
#9. Average high temperature of Tokyo during September is 81 F, and average low temperature of Tokyo during September is 70 F. Due to humidity in Japan temperature may feel hotter if you are not used to in humid climate. Also there is temperature difference between night and day.
The weather in Tokyo in December will be from 0ï½10 degree, pretty cold but rarely snow. However, you might get hot if you walk inside building, underground paths or public transport, which is most of the time in Tokyo. Therefore, if you wear many layers it might become annoying.