BMW officially unveils the 2009 BMW M3 convertible. Powered by a 4.2L V8 that produces 420hp, buyers will be able to choose from either a 6-speed manual or 7-speed M DCT gearbox. Video after the break. Click here for first picture in gallery.

The introduction of BMW’s EfficientDynamics programme – which features Brake Energy Regeneration, Optimum Shift Indicator and lightweight materials – ensures that both running costs and emissions are kept to a minimum. The M3 Convertible returns 21.9 mpg on the combined cycle – a five per cent improvement over the previous generation model

[via Autoblog]

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