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What is it?

A BMW 6-series that very few people will buy, though lots of people ought to; a genuinely powerful diesel convertible with impressive economy, excellent refinement, and a great deal else to recommend it.

BMW has slotted the stonking twin-turbo 3.0-litre straight six from the 3-series and 5-series into its boulevard-cruising 6-series Convertible. Even though the engine provides over 280bhp, BMW claims 40.9mpg, so 600 miles between fill-ups should be possible.Read the full article

I went to test drive the coupe version of this model last weekend, and realised just what a "sporting diesel" is.  An engine with huge reserves of relentless power, very refined, and capable of demolishing most speed intervals in V8 petrol style.