Because small things are not as good or large as large things, the new 2011 Audi A8 is longer, wider and taller than the 2004-'10 model. And not coincidentally, it's also a little bigger than the standard-wheelbase versions of the BMW 7 Series and Lexus LS. Plus it's not much smaller than the long-wheelbase luxo-barges. Plus it'll roll on wheels up to 21 inches across.