My wife and I are very environmentally conscious and have decided that when we replace her car, that we will look at getting an EV. She quite likes the leaf. I quite like the i3. Both are more than we had originally planned to spend on replacing her car. I don't mind paying a bit more for the environmental factor and then saving on road tax and fuel costs, but I'm a little bit apprehensive about buying second hand. What do I need to look for and what should I avoid?