I drive a Mitsubishi Eclipse Cross PHEV. Highway fuel economy is roughly 6L/100Km (about 30mpg) when driving on a depleted battery. Much better than the 9.5L/100Km (24mpg) from the i30 it replaced.

Not as efficient as a Toyota hybrid, but on daily commutes it uses zero fuel and roughly 20kW/100Km.

So the okay fuel economy is offset by the ability to run on electric for 90% of my driving with no range anxiety.