As for the 3 and 4 it all depends on how it's made.

If its Volvo style PHEV then yes, correct. It has normal ICE and gearbox on front and electric motor on rear.

If it's Toyota style PHEV then no. Because then the comparison is not a gasoline car with gearbox etc but it's Toyota's classic hybrids that started with Prius. You basically just take that kind of hybrid, slap in a bigger battery and you're done. They already have electric motors in them instead of traditional gearbox.

5. Case in point: RAV4 Prime. That thing is cool.