The vast majority of car share usage is for short trips within the city. For a trek longer than about fifty miles, you’re better off using a rental car company like Enterprise anyway. The imminent all-electric Nissan Leaf will have a range of 100 miles, enough juice to cross Philly five times on a single charge. And since the cars have their own dedicated parking spots in lots across the city, they can charge up in-between reservations, eliminating the cost and hassle of buying gas and eliminating the worry that they’ll run out of juice. And according to this NPR interview, a lease on the Leaf would cost a consumer about $350/month. That’d pay for itself if the car was rented for just two hours every day.
Car sharing gets people to drive less. Electric cars might make the companies who run them lose less.