dugive different results?
3.1G ./pecan.1 20M ./pecan 75M ./pecan.2 198M ./pecan.week1
EDIT: Don't you hate it when you answer your own question immediately, leaving no point posting? Running
du -hd0 pecangives 3.1G, whereas above that size was shown against pecan.1 (the first entry). Conclusion: du is only counting each file once, ignoring files that have already been included elsewhere.