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How does the Audi A4 'Ultra' model achieve its exceptional fuel efficiency?

I've seen that the Audi A4 'Ultra' model boasts impressive fuel efficiency numbers despite its powerful engine. How does it achieve this and what technology is used in the process?

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The Audi A4 'Ultra' model utilizes the innovative 'Coasting' feature, which decouples the engine from the transmission when coasting and allows the car to conserve fuel.

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The Audi A4 'Ultra' model also features a 'Start-Stop' system, which shuts off the engine when the car is idle, further reducing fuel consumption.

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