How You Can Save on Gas

— -- People are worried about the cost of gasoline and the effect of driving on the environment. Are there things you can do to save gas?

Here are some numbers, put together by the Environmental Protection Agency and the Department of Energy, which suggest that little changes can add up to big savings.

Other things turn out to be urban legends. Open the windows instead of running the air conditioning? Sure, a/c puts a drag on your engine — but the open windows put aerodynamic drag on your car. It's a wash.

In the longer term, a lot of policy makers lament that consumers can't really make much difference (carpooling is great, but not a lot of us do it). Real changes would come from new technology, and -- if Americans go along with it -- more aggressive policy on energy use.