Here are two charts from Google Trends:
PHEV (blue) vs. Humvee (red)
These charts represent the number of searches of the listed terms within the last 12 months by state, according to Google Trends. The top one shows that the term Humvee was searched more than PHEV in all but three states. The darker the red, the greater the imbalance. The bottom map shows the highest percentage of searches of the term PHEV without regard to any other terms. For those unfamiliar with cars, a Humvee is a monster of a quasi-military style vehicle, while PHEV stands for Plug-in Hybrid Electric Vehicle.