 In May 2011 the National Legal and Policy Center announced that some Chevrolet dealers were selling Volts to other dealers and claiming the US $ 7 @,@ 500 federal tax credit for themselves . Then the dealers who bought the Volts sell them as used cars with low mileage to private buyers , who no longer qualify for the credit . General Motors acknowledged that 10 dealer @-@ to @-@ dealer Volt sales had taken place among Chevrolet dealers , but the carmaker said they do not encourage such practice . 
