Here is the first and probably only instrumented test of the A8 W12, those who were worried that the naturally aspirated W12 would not keep up with the turbo 760li and the S600 need not to worry. The S8 should post even better figures.
0-60: 4.1
1/4 mile: 12.6 @ 114.
Top Speed: 128 mph
http://www.caranddriver.com/reviews/...ad-test-review