Yes, a plug in hybrid uses less gas than one that's not plugged in. All the more so if you carefully use your kWh, and return home with a depleted battery.
I do not yet have a charger on my Insight, but I'd like to get one. I'm pretty sure you can buy PHEV conversion kits for the Prius, but I'm not aware of any off-the-shelf solutions for the Insight.
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