Originally Posted by
operator
Don't worry too much about absolute accuracy. The important thing is consistent. You can also verify it against gmaps pedometer for distanced travel. As you ride more you'll realize that all this bike computer stuff is just fluff.
If you're really interested in this sort of thing here's a test for you to try:
Try riding the exact same route 3 or 4 times and see how closely your computer milages compare. Trying to program your computer to be more accurate than the variation among the repeated laps is fooling yourself.