Since acquiring a router with built-in traffic meter about 9 months ago, I have found that its values tend to be in agreement with the usage monitor. That is, until today. I happened to check my usage in the early hours of this morning (following the period change at midnight) and was surprised to see it showing 5.2GB. I hastily checked the router's stats which showed a more sensible value of 0.7GB. I kept an eye on the usage monitor for a couple of hours later this morning, and as it remained over 5GB, I submitted a request for Tech Support to investigate.