Works for me here just outside Louisville KY. It does look like last month it was partial however as my router says 456 GB and the web shows only 250. This month seems to be spot on however.
Mine used to work. Now says 0 as of 7-31-13 4:07pm. When I ckisk on total usage I get We're sorry; we cannot display data usage information because it appears that your modem may need to be replaced. Please call Time Warner Cable Support so we can help you secure your modem and prevent unauthorized access