Most people will develop patterns with the way they drive, distance to work, traffic, etc. so sometimes it seems that the oil life is similar mileage everytime. Originally (I think I was told by a salesman that didn't know better) I thought the way I drove in the beginning would determine the calculations for the life of the car. When I had my Pilot, it did seem the oil life was right around 6k miles, and didn't seem to be affected by regular driving, or distance driving on vacation.
I remember the old Honda days, when it had the indicater that would change colors as the miles got closer to 7500, and had to be reset by sticking your key in the slot by the odometer.