Nissan e-power sounds remarkably like the M4 jazz ...
The only difference being that e-power seems to be a fully
serial hybrid, wheras Honda's e:HEV has *direct drive" as well (bypassing the overhead of first generating electricity when the ICE runs at an efficient speed and has the torque necessary to directly drive the wheels).
As my Jazz is set to L per 100km rather than mpg the bar in the "Range / Fuel / Trip Meter" display clearly shows actual fuel consumption (longer bar = less efficency). The jump upwards in consumption when the system switches from direct drive to the less efficient hybrid mode (at motorway speeds) is clearly visible.
The Nissan engineers would have to be much better at optimizing the ICE's efficiency than Honda's in order to compensate for the losses involved in the permanent conversion process dictated by the serial hybrid concept.