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_16105186_2 (us_national_average_electric_mix VARCHAR, midwest__des_moines_ VARCHAR)
  ### Question:
  What was the US national average electric mix rating for the vehicle that was rated 280 g/mi (174 g/km) in the Midwest?
  ### Answer:
  SELECT us_national_average_electric_mix FROM table_16105186_2 WHERE midwest__des_moines_ = "280 g/mi (174 g/km)"