an article about energy costs, it makes me glad that I live in a city. I predict that my energy usage is probably less than 25% of a normal Americans. Why, is it because I change my everyday life to live without? Nope.
Living in shared space (an apartment / condo) in a larger building is inherently energy efficient. Even more so if there is shared heat / water. The fact that I don't need a car means that there is no car payment, no oil changes, no need to buy gasoline. That's the benefit to walking.
So, for the city dweller, a change in energy costs means next to nothing. For Joeanne Six Pack heating and cooling her exurban McMansion and driving everywhere, well, a small change means big hurt.