I often see the question asked with no real answer, How can the PIP use mg2 up to 62 vs the old 39mph barrier for all electric? This video shows it lies in the the second set of planetary gears and the ratios. You can watch the whole vid if you are really in to the transmission, or take a look at this time where he discusses the mg2 to mg1 ratio differences in models. https://youtu.be/dLNDGUISTYM?t=1249