2014 Porsche Panamera to achieve 91mpg

The Panamera, Porsche's take on the four-door supercar, is to become an unlikely eco-hero thanks to the addition of a new hybrid model.

Proving that the usually mutually exclusive facets of performance and economy can be enjoyed together, the Panamera S E-Hybrid plug in (to give it its full name) boasts 410bhp and will crack 0-62mph in 5.2 seconds, yet still returns an astonishing 91mpg in EU efficiency tests.