OK, the LiveData is here:
as a 3.8 mbyte PDF file. The first frame is the trigger frame.
Putting the Heep in 2nd, I found that the code tripped at about 3500 RPM, at just over 40 mph.
In Drive, it tripped at a much lower RPM, but at the same MPH point. So, it does in fact seem to be linked to MPH rather than RPM.