The Bentley Azure is a large, four-seater luxury convertible from Bentley Motors Limited, a subsidiary of Volkswagen. The Azure is based on the Arnage Drophead Coupￃﾩ prototype, and uses a 6.8ￂﾠL twin-turbo V8 petrol engine which produces 450ￂﾠhp and 645ￂﾠftￂﾷlbf , 450ￂﾠbhp . It is expected to achieve a top speed of 168ￂﾠmph . The United States Department of Energy lists Betley Azure as the least fuel-efficient car in its class with only 9MPG city and 15MPG highway rates.