CREATE TABLE table_57510 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the average number of laps for the driver Piero Taruffi?
SELECT AVG("Laps") FROM table_57510 WHERE "Driver" = 'piero taruffi'
SELECT AVG("Laps") FROM "table_57510" WHERE "Driver" = 'piero taruffi'