CREATE TABLE table_44178 ("Pos." TEXT, "Class" TEXT, "Entrant" TEXT, "Drivers" TEXT, "Laps" FLOAT)

What was the highest amount of laps when the class was v8 and the entrant was diet-coke racing?
SELECT MAX("Laps") FROM table_44178 WHERE "Class" = 'v8' AND "Entrant" = 'diet-coke racing'
SELECT MAX("Laps") FROM "table_44178" WHERE "Class" = 'v8' AND "Entrant" = 'diet-coke racing'