The Infiniti Q70 is essentially a renamed M model, given some small updates for the 2015 model year.

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The largest literal change is the addition of this long-wheelbase version, which adds 6 inches to the overall length.

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This 5.6-liter V-8 engine carries over from the M56 model, making 416 horsepower and 414 pound-feet of torque.

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An all-wheel-drive option, included on this example, is available. The system is completely automatic and designed to enhance traction.

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Infiniti retains a fixed suspension, which lacks the ride quality of luxury competitors.

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The trunk if of moderate size for a big sedan, with 14.9 cubic feet of space.

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As Infiniti's biggest sedan, the cabin is designed for comfort and style.

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Rear-seat passengers gain 5.5 inches of legroom in the long-wheelbase version.

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This cabin design carries over from its M model predecessor.

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The Q7o's steering system features enough boost to make maneuvering this big sedan easy.

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A button on the right steering wheel spoke enables Distance Control Assist, a feature which automatically applies the brake when there is stopped traffic ahead.

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Infiniti's instrument cluster only offers a very small information display.

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The seven-speed transmission features a manual shift position.

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The head unit software is a bit dated, first appearing five years ago.

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A new destination feature is Connected Search, using the car's data connection to look for local businesses.

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The Q70 L also features a telematics system, letting drivers access car functions from a smartphone app.

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The hands-free phone system includes phone book synchronization.

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The music library screen is functional, if not stylish.

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Audio sources for the Q70 L include Bluetooth streaming, iOS integration and USB drive.

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The 16-speaker Bose audio system comes with four speakers mounted on the shoulders of the front seats.

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