Under the hood of the A8 3.0 TFSI quattro is a V6 engine whose mechanical compressor can be deactivated. Power output is now 228 kW (310 hp), an increase of 15 kW (20 hp). The V6 accelerates the standard wheelbase version of the sedan from 0 to 100 km/h (62.14 mph) in 5.7 seconds. Top speed is electronically restricted to 250 km/h (155.34 mph). It consumes on average 7.8 liters per 100 kilometers (30.16 US mpg), corresponding to 183 grams CO2 per kilometer (294.51 g/mile).
The twin-turbo V8 in the A8 4.0 TFSI quattro now produces 320 kW (435 hp), 11 kW (15 hp) more than before. Key performance data: from 0 to 100 km/h (62.14 mph) in 4.5 seconds; average fuel consumption 9.1 liters per 100 kilometers (25.85 US mpg), corresponding to 213 grams CO2 per kilometer (342.79 g/mile). The Audi cylinder on demand (COD) system plays a major role in this efficiency by deactivating four of the eight cylinders under part load.
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