90km/h speed and air resistance is a big difference than something like real world USA freeway cruise control speeds, now repeat the same test at 120km/h and show the results. Still impressive in likely being above 800 km range at the much higher air resistance speed, if I had to make a wild guess.

360Wh/kg for batteries is very noteworthy since some of the very best 18650 or 21700 format, higher amperage capable, li ion cylindrical cells used in UAV applications are right around 255Wh/kg.