On some models, like the Mitsubishi SUV, you can even let the battery charge entirely with regen braking and coasting which you can use later in bad traffic, saving you money even if you never plug it in at all!
When I drive around Chicago, I see millions of cars parked with no place or charging station to plug into. There will probably never be charging stations there, due to maintenance, vandalism, safety and cost issues. With Plug-In Hybrids, it's not a problem. You plug in when you can, but if you can't, you still benefit and save.
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