City dwellers like car sharing because it's convenient -- no need to find parking or handle maintenance issues. Now, in San Diego, it's also more environmentally friendly. By the end of this year, California's second largest city will have 300 vehicles on the road, representing the nation's first all-electric car sharing fleet. Cars will be available at all hours of every day and users will be charged by the minute, hour or day (after a one-time $35 fee). The car-sharing company sponsoring the fleet told local news outlets that it chose San Diego as the first city because of its unprecedented number of charging stations, which will make it easier for people to get around without worrying about running out of battery life. The cars can travel up to 84 miles on a single charge. The city council also unanimously approved changes in the municipal code to create dedicated spaces for more charging stations and allow the electric vehicles to be parked downtown. The car-sharing company is going to reimburse the city for any lost parking meter revenue.