Toyota's new petrol engine has a thermal efficiency of 40%
The new powertrain is due in hybrid form in the next Auris
Toyota has developed a 2.0-litre engine that it claims is the most thermally efficient petrol unit in production.
The new four-cylinder engine is said to have a thermal efficiency of 40% – just 1% short of what the Toyota Prius offers with its 1.8-litre hybrid powertrain.
Toyota said the engine can achieve unparalleled levels of fuel economy as a result of new friction-reducing technology and more efficient exhaust and cooling systems.
It will be rolled out across Toyota’s new global architecture (TNGA) models in the coming years.
The new 2.0-litre petrol engine, which peaks at 169bhp, will also offered with hybrid electric power. In this guise, it will match the Prius’s 41% thermal efficiency but offers more performance thanks to its larger capacity.