The Chevrolet Impala Bi-Fuel was supposed to go on sale in the summer of 2014 with gasoline and compressed natural gas for power. However, delays surrounding its CNG system mean that they still aren't at dealers.
Currently, the only natural-gas-powered passenger car offered for sale by an OEM in the US is the Honda Civic Natural Gas. Starting this fall, that long-running CNG car will be joined by a CNG-burning 2015 Chevy Impala for both fleet and retail customers. General Motors announced today that the car will start at $37,385, plus an $825 destination charge. That comes to $38,210 before taxes and options.