BMW unveiled the Concept X6 at the Frankfurt Motor Show, in Germany, to showcase the firm's latest developments in hybrid engine technology.

The four-door coupe can be driven on electric power only, on the combustion engine alone, or with a combination of both power units.

The end result is a reduction in fuel consumption by up to 20 per cent compared with a comparable BMW running on a combustion engine alone.

BMW also revealed updates on the 1 Series and 6 Series coupé at Frankfurt.

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