Bully Dog watch dog monitor

I've got an Edge Insight on my Chevy and when OnStar was active, it could tell that I had something connected to the port. But it cannot void warranty since it is only a reader of existing data. Also, what can be displayed is determined by the available PIDs and that depends on manufacturer, model and year. I can read MPGs, both instantaneous and average, but the average is a rolling average, not a cumulative average if that makes sense. I don't know the number or frequency of sampling and can't get a trip average mpg. Not sure about displaying gear selected, but if I put the Allison in Manual rather than Drive, then the gear selector display shows which gear the transmission is in.