This is the promise of the rotary engine, a century-old technology that stalled two decades ago but may rev again.

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The last serious attempt, Felix Wankel's rotary engine, lingers on in Mazda's sports cars and is also used to power snowmobiles.

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Push the backlit engine-start button and the dashboard air vents automatically rotate open while the rotary shift knob rises up from the center console.

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