We're with BT for broadband, for a couple of years on the standard service, and had started to reach (and a few times exceeded) the download limit of 10GB, so upgraded to Infinity with a 40GB limit.
Now, as far as I know, nothing major has changed in our usage since that upgrade - but in the first month we used 47GB, and in the second 58GB!
According to the technical expert I discussed this with, even doing the same amount, we'll use more download simply being on a faster connection. What?!?!?
Does that make any sort of [technical] sense?