[bikestuff]

On my Allison transmission control panel I have a Button labeled "Mode".  Right above the button I have a label "Perf".  So my question is....What is the button for and how do I use it?  I did a little research, and in general the Mode button changes the software settings in the transmission to choose different shift points.  The choice of the software changes are determined by the OEM manufacturer (Newell).

On my most recent trip, I experimented with the button.  I could not detect any specific change caused by the Perf button.  

Does anyone know what the button actually does?  

Cheers,
bill