The official government process used to test and certify those ranges has potential flaws. The U.S. Environmental Protection Agency has been testing vehicles since 1971, but only started testing EVs in 2012. EPA Engineers say these are exciting times, but it can also feel like the "wild west." The fact that it can test any vehicle at any time forces automakers to meet EPA standards. But independent groups have found that their own tests yield results that are different from official EPA range ratings.

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Organizations: Environmental Protection Agency, EPA Engineers, EPA Locations: U.S