My latest Jazz, has been supplied with a Honda document entitled EC Certificate of Conformity.
This gives the following information, relating to power output .
Total net power 79Kw (ICE)
Maximum net power 90Kw (EV)
Maximum 30 minutes power 45Kw (EV)
Maximum speed 175 Km/h
I assume the 30min figure is average max power over 30min, presumably to control any overheating of the EV motor.
This translates to an average of around 60HP which I guess is more than adequate to cope with continuous Motorway driving.