How many PW values ?

[fphil]

I know that VT may give  2 different values for the one data: the VT calculated one and the ECU one.

But concerning the PW ( per ex) they are 3 !?
- The one from the VT gauge which seems to be the ECU one eg. 2.6 ms or 2.61 ms
- the one given from the VT log iewer eg. 2.4 ms
- the one calculated by VT eg. 2.69ms

Does someone know from where does  this logviewer value of 2.4ms come ?