Audi's flagship luxury sedan, the A8, comes in two different lengths (and wheelbases)—A8 and A8 L. The 'L' in the 2011 Audi A8 L might as well stand for luxury, rather than length, as it's the way to go if you ever plan to have adults ride in back. It's about five inches longer in both wheelbase and length, with nearly all of that added...

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