I don't have a similar model but all Hondas I've had an A & B setting for the odometer which you can reset to zero, plus the actual total car mileage from new, you can toggle through these in a loop, A & B will give you the mpg for that displayed mileage (since it was last reset to zero) and when it displays the car's full mileage you get the mpg for setting A.
I would say from your description that the figures you can see are the mileage for A, B or the life of the car.