Surely, the s/w is intelligent enuff to convert past readings as well as future readings to keep them in step. After all, it's only a change of units, not quantities. I can do it with NetMeter.
Think we are using diff meanings of "usage". I was talking about "common usage" not "BB usage". Anyway it is clearest to measure BB usage/allowance in Bytes, while speeds are in bits/sec. Again, NetMeter can.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU BB => 2010: Orange 16 Meg LLU BB