Totally disagree. One of the reasons I drive an EV is so I _can_ plug it in and never go to a gas station again. What a useless exercise and waste of my time, especially for a penny-pincher like me who would wait in like for 20 minutes at Costco for gas.
The surface area of a car usable for solar panels is about 3 square meters. At the absolute best, when the stars align just right, you're going to get about 1 kW of power out of these panels.
In other words, barely enough to offset the auxiliary systems in the car (cooling pumps, lights, computers, etc.)
For those not with an overnihht charging parking spot I can see the appeal though.