The Bentley Continental GTC Speed (W12) is a high-performance luxury convertible that boasts impressive power and style. It features a 6.0-liter W12 engine that delivers 650 horsepower and 664 lb-ft of torque, allowing it to reach a top speed of 208 mph (335 km/h).

However, this kind of power comes at a cost, and the Bentley Continental GTC Speed's fuel consumption and CO₂ emissions are quite high. According to the WLTP drive cycle, its combined fuel consumption is 20 mpg (14.1 l/100 km), which is relatively low compared to other cars in its class. The combined CO₂ emissions of the car are also relatively high, at 320 g/km.

Despite these figures, the Bentley Continental GTC Speed is still a highly desirable car, thanks to its luxurious interior, advanced technology features, and exceptional driving performance. It offers a smooth and comfortable ride, and the convertible top adds to the thrill of driving this powerful machine.

Overall, the Bentley Continental GTC Speed is a prime example of a car that prioritizes performance and luxury over fuel efficiency and environmental impact. While it may not be the most eco-friendly car on the market, it is sure to turn heads and provide an exhilarating driving experience.