I hate to say this, but 166MB's a day is not enough for even the person doing the barest of the barest of online surfing or downloading.
That 40GB's a month is also not enough for even the middle-range downloaders as well, since movies, music and streaming video are pretty big files.
I'll be blunt: I stayed away from Bittorrent for a month not too long ago, and I was shocked at how much bandwidth I had used at the end of the month: 100GB's.
Now, I am on the internet quite a bit watching online video, posting on forums, etc........ but no more than other people my age are.
So if my bandwidth usage is that high JUST with using internet browsers and FTP.... these amounts for a normal user are kinda 'low', to be blunt.