For 'rule-of-thumb', substitute 'sanity check'. If you result is wildly divergent, you might double-check. Are you seeing 83 watt-hours/mile?
Edit:
Quote:
...pushing a Nissan Leaf with a Honda PCX 150...
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I'm thinking I'd like to push the Arcimoto electric tadpole with a Vespa motor scooter converted to a one-wheel trailer.