As in the petrol-driven Mii models, the Ecofuel version features a three-cylinder spark-ignition engine with a displacement of 999 cc. In the CNG variant, the compact power unit generates 68 PS at 6,200 rpm. The exceptionally lightweight and high-revving engine reaches its maximum torque of 90 Nm at 3,000 rpm. Its average fuel consumption of just 2.9 kg of CNG per one hundred kilometers and the associated CO2 figure of just 79 g/km are best-in-class.
The SEAT Mii Ecofuel, which is making its debut at the Geneva Motor Show 2013 (4-6 March), will be initially introduced in markets such as Germany, Italy, Austria, Switzerland, the Netherlands, Sweden and the Czech Republic where there is a clear demand for natural gas-powered cars and the infrastructure to support it.