BMW says the new, second-generation M6 convertible is the fastest-accelerating open-top road car it has ever built. Which is a fair enough statement given that it hits 62mph from standstill in 4.3sec, rockets from 50-75mph in fourth gear in a rather special 3.8sec and runs the standing kilometre in 22.1sec – in each discipline outpacing the old M6 convertible, its previously fastest series production open-top.












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