I wanted to figure out why I had excess usage this month using a data analysis tool I wrote in Excel. I tried dowloading the data and unfortunately the "usage" column is not useful, it contains things like "10.150 KB" and "142.990 MB". There should be a column which is all in KB or MB without needing to be massaged by hand to a common unit. The CSV version is even worse; the columns are not separated by commas, but by "|" delimiters, which can only be used with more data massage.
When finally did massage the data, I noticed that the sum of the data usages listed on the daily/every-three-hour items adds up to 1.9 GB, not the 2.5 GB that the site is telling me I supposedly used. Does it round up all the sub-1MB items to 1 MB? Clearly I am being charged for the higher use, not the lower.