[Evolved]

I've tested this theory and others on my commute. Whether I speed up and never let anyone in (nearly impossible since someone won't care and will merge knowing you'll most likely not hit them) or keep a good 7-10 car distance, it doesn't matter. My commute on the freeway with either of these two ways or on side streets is always 45 minutes +/- 1 minute.

The difference is I'm using less gas and putting less wear on my clutch, brakes, etc. by leaving a big gap between myself and the cars in front of me.

Furthermore I find that my demeanor is much more calm and relaxed when I leave a big gap because I'm not tensing up to avoid rear ending someone every time I stop.