The Plug-in mod for a Prius sounds really good, until you find out all the real actual details and limitations and issues with them. I don't think they are worth it after I looked into them as possible a business installing them.
The Enginer keeps the heavy OEM battery, and in fact, overuses it so it won't last as long and gains you very little and adds a lot of complexity (and failures) The others are expensive and then you don't even really have an PHEV, you have a prius hybrid with more battery, not an EV with gas backup, because it NEEDS the gas engine to operate properly no matter what some want you to believe.
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