CREATE TABLE table_46473 ("Round" FLOAT, "Name" TEXT, "Circuit" TEXT, "Date" TEXT, "Winning driver" TEXT, "Winning car" TEXT)

What circuit did emilio de villota win on at the pace petroleum trophy?
SELECT "Circuit" FROM table_46473 WHERE "Winning driver" = 'emilio de villota' AND "Name" = 'pace petroleum trophy'
SELECT "Circuit" FROM "table_46473" WHERE "Name" = 'pace petroleum trophy' AND "Winning driver" = 'emilio de villota'