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.
October is one of the best month to travel Japan. Not too hot, not too cold. Average temperature in Tokyo is 17 celcious degree. October is not a busy season but if you travel from October 6th to 8th, it's better to book hotels/trains early. This is 3-day holidays in Japan and many people go out for vacation.