CREATE TABLE table_28517 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

how many series had 6.55 u.s. viewers (million) and were directed by pete michels
SELECT COUNT("No. in series") FROM table_28517 WHERE "U.S. viewers (million)" = '6.55' AND "Directed by" = 'Pete Michels'
SELECT COUNT("No. in series") FROM "table_28517" WHERE "Directed by" = 'Pete Michels' AND "U.S. viewers (million)" = '6.55'