I find the most intersting thing is that I'm not racing to red lights any more. Once you get the idea of how long lights take to change and stuff you end up coasting 1/4 mile to the light and have it turn green and trafic moving by the time you get there. So instead of wasting a minute or so at a light you gain higher milage because you are coasting and not using your engine. (does that make sense?) I find my 40minute comute isn't any longer when I drive conservatively.