So, the bike store set up my cyclecomputer, but they didn't set up the 'computer' part.
The computer has my tire circumference set at 205cm, when in fact it is 216cm.
A little bit of quick math...
444.5km=44,450,000cm
44,450,000cm/205cm=216829revs
216829*216cm=46835064cm
46835064cm=468.4km
So, while my computer says I've biked 444.5km, I've actually biked 468.4km!
I've been biking around for more than a month, with incorrect data!!! That kind of thing drives me nuts! If you're going to set something up, don't do a half-assed job, do it right.