text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_23840623_4 (epa_rated_combined_fuel_economy VARCHAR, operating_mode VARCHAR, dirty_electric_grid_rocky_mountains__denver_ VARCHAR)
  ### Question:
  What is the epa rated combined fuel economy for the all-electric vehicle with dirty electric grid rocky mountains (denver) of 330 g/mi (205 g/km)?
  ### Answer:
  SELECT epa_rated_combined_fuel_economy FROM table_23840623_4 WHERE operating_mode = "All-electric" AND dirty_electric_grid_rocky_mountains__denver_ = "330 g/mi (205 g/km)"