So apparently the EPA doesn't do any of the certification testing for ev's right now. Instead they leave it up to each manufacturer.
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http://avt.inel.gov/pdf/uev/eva/etautp3r0.pdf
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"While EPA strives to periodically update the regulatory test procedures such that all technologies are appropriately addressed, there may be instances when some emerging technologies or fuels are not able to be tested using existing regulations. Because of this, EPA has special regulatory provisions that allow EPA to direct manufacturers to test such vehicles using methods specified by EPA. Similarly, EPA is able to determine the content and appearance of the fuel economy labels when existing regulations do not appropriately address the technology or the fuel being used. For example, the regulations do not currently address how to determine City and Highway fuel efficiency values for electric vehicles. During the period when regulations are being developed for electric vehicles, EPA has specified, for example, that manufacturers use an accepted procedure developed by the Society of Automotive Engineers: the procedure known as SAE J1634. Further, to better approximate expected real-world performance, EPA has directed that the manufacturers adjust the test results (including City and Highway fuel efficiency and driving range) for the fuel economy label using equations and methods specified in the regulations."