Audi has a new version of the venerable S8 to woo luxury performance buyers with. The car is the new Audi S8, and its heart is a Biturbo V8. That V8 engine makes 571 hp and 590 pound-ft of torque and offers up to 20.8 mpg. Audi fitted the V8 with mild-hybrid technology.

The top speed for the S8 is limited to 155.3 mph, and the car can reach 62.1 mph from a stop in 3.8 seconds. The car also has automatically actuated flaps in the exhaust system for improved sound. The mild-hybrid system uses a 48V belt alternator starter and an additional lithium-ion battery to enable coasting with the engine switched off.
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https://www.slashgear.com/audi-s8-offers-bi-turbo-4-0l-v8-with-571hp-and-590-lb-ft-torque-18599977/