I don't think there's a good way to tell how full the Insight's battery is. Even the computer can't tell, so one problem you'll have by topping it off at night/at work is that when you get in it to drive, the computer will be under the assumption that it's at the same capacity as when it was parked and will charge/assist based on its assumed battery level. I'm considering trying it anyway, by putting my grid charger on a timer and only adding a couple of hours of charge.
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