CREATE TABLE table_15171 ("Stage" TEXT, "Date" TEXT, "Course" TEXT, "Distance" TEXT, "Winner" TEXT, "Race Leader" TEXT)

Who's the race leader of Cuneo to Turin?
SELECT "Race Leader" FROM table_15171 WHERE "Course" = 'cuneo to turin'
SELECT "Race Leader" FROM "table_15171" WHERE "Course" = 'cuneo to turin'