If you were rushing up to red lights, driving fast, etc. You probably didn't save any time in your commute.
Try driving as aggressive as you can one day on the commute, and then try hypermiling another. The time difference is negligible. I've even came out ahead on some commutes by taking my time.
The only time you can make a difference in time in driving style is long distances and averaging much higher speeds. (Speeding at 90 mph over a long distance, versus just doing the speed limit)
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