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Message: <blockquote data-quote="cwerdna" data-source="post: 4760" data-attributes="member: 267">^^^^You can't make accurate calculations that way.  Charging is not 100% efficient.  Not all the electricity coming out of the wall makes into the battery pack.  There are inefficiencies in the on-board charger and other charging overheard (e.g. coolant pumps and possibly fans to).  I'm pretty confident that if you have 21 kwh usable and you drove the car till it was totally dead, it'd take longer that figures you state.</blockquote>