Maybe this "relaxed" stability referred to by Brian is the reason the 330 is so difficult to hand fly at high altitudes, in direct and alternate law, as mentioned in the first post by Rex. Anyone ever try this (not in RVSM airspace)?
1% fuel penalty. Sounds more reasonable than the 3-5% mentioned in the link from Woodpecker. But....maybe the article meant the difference between full forward and full aft is in the 3 - 5% range