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Just to flag that MacKay already estimated (in 2008) a Tesla at 15kwh per 100km (actually better than you have here). See Fig 20.22 on https://climate.lifeitself.us/without-hot-air/chap20/

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I am less concerned about the consumption, but the issue how much available wind energy we can harness in a best case scenario. Only half of transportation seems so low.

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