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I've been reading that some owners need to replace 25% or more of the energy used to drive the Roadster because of the battery pack management and cooling needs. This would seem to be a drawback in Tesla's battery pack technology if it is indeed the norm. Has anyone else seen similar numbers? What is the average charge efficiency?

Example:
Due to cooling and other losses in charging, filling from empty takes about 68 kWh, or 26% more than 54 kWh the battery holds. This 68 kWh is the seminal amount; it quantifies how much truly is needed.
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http://www.teslamotors.com/blog/pvev-we’re-getting-72-miles-day-sunlight-or-72-mps

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