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Is 1000km from 100kWh a realistic number?

My guess was a lot more kW than that.

NIO got just over 1,000 km out of their 150 kWh battery in winter at an average speed of 83.9 kph:

They're not telling us, so I'm assuming what's required for a very small, efficient car. It could easily be 50-100% more than that.