Quote Originally Posted by Bruce View Post
The VAG engineers do this so that a measuring value group can pull the info you need without requesting multiple groups. Each request for a measuring value in the older control modules, actually pulls all 4 values in the measuring group. The more groups you ask to view, the slower the the sample rate. So, the VAG engineers will put the same item in multiple groups to keep the sample rates high - improving the graphs that can be created from the values.
Even more to the point, for more than a decade, VW's own tools could only show you ONE group at a time. So values that were commonly used as a reference (for example RPM) were included in many groups.