Being an accountant, I follow the good old GAAP principle of conservatism. I always round DOWN my kilometrage just so I know I've done the kilometers, just in case the computer is reading high. So if the computer says 19.85 km, I record 19 km. The only exception might be if the computer reads higher than .98, then I just might round up. So at the end of the year, there's always a discrepancy between my recorded kilometers and the odometer. Like last year, I booked 19,000 km, but the computers added together were over 20,000.

This sometimes leads to dysfunctional behavior. Like if I see 19.75 km as I'm approaching home, and I know I've got .15 km to my front door, I just might ride past the house and make a u-turn another fifty meters down the road just so I'll get a reading one km higher.

It would probably make more sense just to round, but to use .6 km (instead of .5) as the mid-point to account for the computer error.

- L.