CREATE TABLE table_70352 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

What is the average year for Maserati Straight-4 Engines?
SELECT AVG("Year") FROM table_70352 WHERE "Engine" = 'maserati straight-4'
SELECT AVG("Year") FROM "table_70352" WHERE "Engine" = 'maserati straight-4'