The automotive industry has had to answer some difficult questions when it comes to emissions and sustainability. Almost five years since the story broke, fallout from the diesel emissions scandal continues to have an impact. The latest media reports suggest that FCA, Daimler and Volkswagen are still under the microscope, with Daimler recently being issued a fresh $960m fine and Volkswagen’s CEO Herbert Diess and chairman Hans Dieter Pötsch both facing allegations of having misled investors.

Other vehicle manufacturers have also been accused of using questionable methods in order to pass emissions tests, such as over-inflating tyres to reduce rolling resistance, taping over grills and cracks to improve aerodynamics, and removing the alternator and brakes to eliminate friction.

But despite this, all carmakers like to be seen as eco-conscious…