I have owned PHEVs and like them quite a bit, but if I'd bought them new I still wouldn't have reached the payback period. It seems that a PHEV typically costs $12k more than the ICE version, so the payback period is quite long (I think I estimated it to be 50k miles, assuming you charge for free at work, and gas is $5/gallon).
EVs and PHEVs can be great for some people, and some may even save money with them (maintenance is blessedly low). But I find it unlikely that for "most" US drivers, they would save money (and of course they would save on emissions, this is kind of a useless thing to add to the headline).