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The Continental GT Speed Convertible, Bentley's new open-top performance flagship - and the world's fastest four-seat convertible - makes its international debut on 14th January at the North American International Auto Show, Detroit. The new GT Speed Convertible combines the sensory pleasures of roof-down luxury touring with the shattering performance of a 625 PS (616 bhp) twin-turbocharged 6.0 litre W12, while delivering a fifteen per cent improvement in fuel efficiency. The close-ratio eight-speed transmission, uprated and...Read.