Mazda has revealed its all-new Mazda2 will debut with the Skyactiv-D 1.5, a brand-new 1.5-litre clean diesel engine, when the carmaker introduces its next-generation B-segment model, which will be initially launched in Japan.

First unveiled in March at the Geneva International Motor Show alongside the Mazda Hazumi concept - the basis for the all-new Mazda2, the Skyactiv-D 1.5 shares much with its sibling the Skyactiv-D 2.2 diesel, which is available in the Mazda CX-5, Mazda6 and Mazda3.

The Skyactiv-D 1.5 was developed in the pursuit of ideal combustion despite a very low compression ratio.

New innovations for the small-displacement newcomer to the Skyactiv range include an expanded homogenous lean burn range, even less mechanical resistance, and new insulation technology to counter the increased cooling loss associated with a smaller engine.

In addition to the Skyactiv-D 1.5, the all-new Mazda2 will come equipped with the full line-up of Skyactiv Technology, including the highly efficient six-speed Skyactiv-Drive automatic and Skyactiv-MT manual transmissions.

It will also have the carmaker’s fuel-saving i-stop idle-stop and i-Eloop brake energy regeneration systems.

Mazda expects its new clean diesel-powered supermini to achieve the best fuel economy of any combustion-engine powered vehicle available in Japan. The S Skyactiv-D 1.5 should be popular in Europe, too.