Although only about a foot longer than the Audi A4, the A6 is a substantial leap forward in luxury and price.

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Adaptive headlights are standard in the 4.2-liter A6. We like the way the hood meets the front fascia around the grille.

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The roofline presents a nice curve, although rear seat headroom is compromised. Windows stretching behind the rear seat are a nice touch, letting in a little more light.

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The 350 horsepower 4.2-liter V-8 gives the car lots of power, but only average fuel economy.

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The cabin of the A6 feels very luxurious, with thick, solid materials used throughout.

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The 4.2-liter version of the A6 comes with Quattro all-wheel-drive standard, giving the car excellent handling.

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Audi keeps its steering wheel controls simple, so the driver isn't overwhelmed with buttons.

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Audi uses a screen between the speedometer and tachometer to show useful information, such as navigation guidance, audio information, or cell phone status.

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The six speed automatic transmission shifts smoothly. Its Sport setting downshifts aggressively, but its timing is too slow for real sport driving.

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The hardware for Audi's MMI interface is easy to learn, and well-positioned in the car for effortless access.

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The navigation system works reasonably well, but it isn't as advanced as others we've seen. For example, it won't offer multiple routes to a destination.

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Entering addresses with the rotary controller can be very tedious.

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The optional Audi Music Interface is a module in the glove compartment, with a connector for your iPod.

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Selecting music from an iPod through the Audi's MMI is very easy.

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The A6 gets Sirius satellite radio as part of its Technology package.

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When playing CDs or satellite radio, you can use this screen to play, pause, and skip forward, but we didn't find it very useful, preferring the track list view.

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The Bose system lets you use surround sound for the front or back, but not both at the same time. We generally preferred the non-surround setting.

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The Bluetooth hands-free system in the Audi A6 works excellently, displaying your phone's address book without requiring you to copy it to the car. However, you can import it if you want.

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