Important to note that any appreciable amount of home charging makes it a lot harder for gas to beat EVs or PHEVs most places and my calculations above are for 100% fast charging. PHEVs are hard to calculate for because where they land between hybrids and full EVs is basically entirely dependent on the user but the upshot (ignoring emissions) is that the best PHEVs aren't much worse than the best hybrids or the best EVs so you can choose the cheapest fuel on a day-to-day basis and potentially come out ahead.
https://www.fueleconomy.gov/feg/Find.do?action=sbs&id=42814
You've got a much smaller battery so the at-home charging cost should be less. But look at that combined mpge!
They seem like a nice idea for this transitional period but it appears they are just becoming luxury vehicles that are produced in small quantities.