Toyota is aiming to set a new standard for CO2 emissions with the Yaris hybrid by undercutting the current class leaders.
The company is hoping to get the new hybrid supermini below the 85g/km of the new Kia Rio 1.1 CRDi EcoDynamics, the cleanest conventionally engined car on sale in the UK.
The cleanest Yaris will use an all-new hybrid setup, pairing a 1.5-litre petrol engine with a nickel metal hydride battery located under the back seats. Toyota is remaining coy on details such as total power and performance for now though.
The hybrid will take its place at the top of the Yaris range, with a price tag similar to the T-Spirit 1.33-litre petrol.
This means it will cost buyers around £15,000 when it goes on sale next April. Toyota is also planning to launch two further hybrids next year - the seven-seat Prius plus in the summer and the plug-in Prius later in 2012.