An all-new V8 engine, the 4.0 TFSI, provides a hefty 309kW of power and 550Nm of torque to these superb top-of-the-range vehicles, yet thanks to its cylinder-on-demand system, which switches off four of the eight cylinders under lighter engine loads, is a significant contributor to efficient driving. The S6 and S7 Sportback deliver a fuel [...]

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