CREATE TABLE table_56744 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What's the highest turnout when carlton was playing as the away team?
SELECT MAX("Crowd") FROM table_56744 WHERE "Away team" = 'carlton'
SELECT MAX("Crowd") FROM "table_56744" WHERE "Away team" = 'carlton'