[joey]

I have never seen anyone verify the accuracy of flashpaq on any of the major three forums, LXforums, 300Cforums, and Chargerforums.

One thing I don't like about the flashpaq datalogging is each incremental increase in seconds is not consistent. One time increment will be 0.22 seconds, and the next will be 0.20 seconds. This makes it very hard to compare runs and to see when the exact point shifts are occurring, when timing advance reached its peak/highest, etc.

Another more significant problem is time increments are different on different runs. On the first pic below, the time increments are around 0.20 to .22.
On the next run the increment is around 0.54. A difference of half a second between each reading/increment is huge IMO.

This issue is not exactly what you are asking about, but it may effect times depending what time increments the flashpaq chooses to use for a particular run.
Attached are pics of two data logs and shows how the time increments are different between the two runs, and different in the same run.