CREATE TABLE "table1_26448179_4" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real,
  "u_s_viewers_millions" text
);

Question: What is the title of the episode watched by 3.2 million viewers?
SQL: SELECT "title" FROM "table1_26448179_4" WHERE "u_s_viewers_millions"='3.2';

Question: What is the title of the episode with production code 305?
SQL: SELECT "title" FROM "table1_26448179_4" WHERE "production_code"=305;

Question: How many air dates had 3.2 million viewers?
SQL: SELECT COUNT("original_air_date") FROM "table1_26448179_4" WHERE "u_s_viewers_millions"='3.2';

Question: What is the highest production code?
SQL: SELECT MAX("production_code") FROM "table1_26448179_4";