That's the same way Honda IMA hybrids work - restart the engine when you release the brake.
I use a manual "auto-stop" technique where I turn the key when the light goes green. Because I'm watching and ready to go, half the time I'm still the first one off the line. A warmed-up car takes very little time to restart.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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