Well, if she can't afford a car, she's not going to be burning much gas anyway. (Cheapest regular car - $13,000, Versa. Cheapest EV after incentives - $15,000, iMev.) But that single mother isn't going to be buying a new car anyway. She's going to be buying used - and nowadays hybrids, pluggables and pure electrics are available used. Well, now you are talking about two different things. People who are needy and deserving, and reducing oil usage and environmental impact. And those often aren't the same - keeping that mother of two on the bus is a better choice for the environment, but she might not see it that way.