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"“I don't think they're lying,” Jaffe said. “I just think they left something out of the public reveal that would have explained how these numbers work.”" Tesla’s Newest Promises Break the Laws of Batteries https://www.bloomberg.com/amp/news/articles/2017-11-24/tesla-s-newest-promises-break-the-laws-of-batteries
(if not lying, I think they're making the most optimistic predictions that back-of-the-cocktail-napkin equations can justify)