 On the roadways, electric vehicles in America are running into some power problems. A new survey finds about half of those who own new EVs say they switch back to traditional gas-powered cars the next time around. Consulting firm McKinsey & Company finds car buyers are skeptical about the long-term commitment from battery-powered vehicle makers. It's really not that drivers don't like their green energy choice, it's just that the cost to buy, then charge and maintain those vehicles are creating headaches.