What was the emission rating in Mid-Atlantic South for the vehicle that was rated 300 g/mi (186 g/km) in the Midwest?
CREATE TABLE "table1_16105186_2" (
  "vehicle" text,
  "epa_rated_all_electric_range" text,
  "epa_rated_combined_fuel_economy" text,
  "alaska_juneau" text,
  "california_san_francisco" text,
  "mid_atlantic_south_washington_d_c" text,
  "u_s_national_average_electric_mix" text,
  "southeast_atlanta" text,
  "midwest_des_moines" text,
  "rocky_mountains_denver" text
);
SELECT "mid_atlantic_south_washington_d_c" FROM "table1_16105186_2" WHERE "midwest_des_moines"='300 g/mi (186 g/km)';