I was wondering if any of you ever calculated this. By putting in larger volume filters, my 1996 Avalon will average 7 quarts per 6000 miles, oil changes included. So the engine itself appears in pretty good shape. There is not much room for stuff like MMO unless that is added as part of the fill when I change the oil. Oil consumption will pick up toward the end of the oil's useful life. I have been running blends of dino oil and synthetic as of late. How about you?