Jaguar says the Ingenium power units will be up to 80kg lighter than today’s equivalent engines, a weight saving roughly equivalent to an adult passenger – again, extensive use of aluminium makes a big difference here.

The first Ingenium engine to go into production early next year, is a 2.0-litre diesel code-named AJ200D.

Jaguar says that friction is reduced by 17 per cent compared its current engines, making it one of the most efficient and responsive 2.0-litre turbo diesels on offer.

Combined, the efficient new engines and lightweight bodywork will allow at least some versions of the Jaguar XE to achieve 75 MPG – but the details will have to await the car’s official unveiling in September.