keep in mind dropping the battery voltage constantly on a typical car battery will shorten its life. i know the mileage game is the goal but not at the expense of a 100$ battery(money, pollution/inconvenience). i would say from my own guesstimate a battery only needs about 30 mins of running time to FULLY charge, from like a dead/jumpstart situation. that being said, i gave up shutting my engine off at stops, unless i know they are lengthy, like a train crossing.
alternatively, EOC/no idling as much as you want in the day time, conservatively or lights off at night only. and if you must, just stop doing it for the last 15-20 mins of your drive home before you park, to let the battery recover
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