how many series had 6.55 u.s. viewers (million) and were directed by pete michels
CREATE TABLE "table1_26259391_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_million" text
);
SELECT COUNT("no_in_series") FROM "table1_26259391_1" WHERE "u_s_viewers_million"='6.55' AND "directed_by"='Pete Michels';