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Doesn't feel quite as special as an S-class Until Audi produces an S8 or reverses its decision not to drop the W12 engine into the car, the 55 TFSI will remain the quickest A8 in a straight line ...

Nice and straightforward. Well, not as straightforward as it might have been given Audi now calls them the 50 TDI and 55 TFSI, but that’s why we’re here. The 50 TDI produces 282bhp at 3750rpm ...