This index monitors convertible and roadster luxury cars, measuring al fresco motoring appeal and open-air driving experience premiums. It includes key models Mercedes-Benz 300SL Roadster, Jaguar E-Type Roadster, Porsche 356 Speedster, Ferrari 250 GT California, Aston Martin DB4 Convertible, BMW Z8, Lamborghini Gallardo Spyder, McLaren 650S Spider and Bentley Continental GTC.
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