Here you have the energy / power consumption (economy) of all-electric Citroen e-C4 2020/2021 - 100 kW, 136 HP, 260 Nm, FWD, 50 kWh batteries (gross) in city, highway, motorway, freeway and autobahn.

Results for Citroen e-C4:
eco city: 12.7 kWh/100 km / 20.4 kWh/100 mi / 4.89 mpkWh
estimated range in a city: ~330-345 km (~205-215 mi)

90 km/h (56 mph): 15.2 kWh/100 km / 24.5 kWh/100 mi / 4.09 mpkWh
estimated range at 90 km/h: ~275-290 km (~170-180 mi)

120 km/h (75 mph): 22.8 kWh/100 km / 36.7 kWh/100 mi / 2.73 mpkWh
estimated range at 120 km/h: ~180-190 km (~110-120 mi)

140 km/h (87 mph): 28.2 kWh/100 km / 45.4 kWh/100 mi / 2.2 mpkWh
estimated range at 140 km/h: ~145-155 km (~85-95 mi)

Procedure:
I drive 33 km in both ways on a highway/motorway (16.5 in each direction). Energy consumption/economy in a city is measured in real-life traffic in Warsaw (Poland) in similar conditions: the same amount of heavy traffic, light traffic and quite similar average speed. If you have any question, just write in in the comment section :)