Audi A8 4.2 FSI quattro, BMW 750i xDrive, Mercedes S 500 4MATIC (Link Inside)
 

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A8 is the fastest, yet least powerful of the 3 Germans and was just slightly beat by the S500 in fuel economy, 13 liters(A8) to 12.8 liters(S500)/100 kilometer, 750i wasn't even close. So far the A8 remains the luxury car to beat....