What Car? says...

The Audi S8 has some striking vital statistics. It’s almost 5.2 metres long and weighs nearly 2.3 tonnes. It probably has more square metres of leather in it than Air Force One, and yet it can steam you from 0-62mph in 3.8sec.

The S8 might look like a relatively unassuming luxury limousine, and there's not a huge amount to differentiate it visually from the regular Audi A8 saloon on which it's based. But, thanks to a mighty 563bhp 4.0-litre V8 engine under the bonnet, it's almost as fast as the Audi R8 supercar.