The spin you put on the data
The spin you put on the data is one way to see the data. However, if you plot the % of EV vs PHEV, the % of EV of all plug in vehicles is consistently increasing. This suggests to me that perhaps the polls indicating interest in green vehicles have peaked is a bit premature. Even in my rural area, I have great interest in my Tesla. The increasing number of locations and participants, for example, in National Drive Electric Week suggests that interest in green vehicles are increasing.