| 2013-03-01 | 0 Comments

SEAT is expanding the Mii family with the introduction of the new SEAT Mii Ecofuel – the company’s lowest-emitting production car ever – running on compressed natural gas (CNG).

Seat_Mii_Ecofuel_1The first model with a CNG engine to wear a SEAT badge, and making its debut at the Geneva Motor Show 2013, the Mii Ecofuel boasts average consumption of just 2.9 kg CNG/100 km. And because of the CNG, the running costs are approximately half those of a Mii with a petrol engine. Its CO2 figure of just 79 g/km is best-in-class. The low consumption and emissions figures are achieved through standard fit fuel-saving Ecomotive Technology, including a Start/Stop system and a Brake Energy Recovery system.
Seat_Mii_Ecofuel_2The 1.0-litre, 68 PS engine is based on the three-cylinder petrol unit found in the Mii (with 60 PS and 75 PS outputs), but it’s been specifically developed for CNG operation. The exceptionally lightweight and high-revving engine reaches its maximum torque of 90 Nm at 3,000 rpm.
Seat_Mii_Ecofuel_8An increase in compression ratio from 10.5:1 to 11.5:1 improves combustion efficiency in CNG operation. Because of the higher pressures and combustion chamber temperatures, the spark plugs now have a higher ignition voltage. The lower lubrication characteristics of gaseous fuels are compensated by different valves, as well as special guides and valve seats. The cam profiles and engine control unit are also modified. The engine control unit uses a lambda sensor to recognise the different qualities of ‘low gas’ and ‘high gas’. When running on low gas, which has a lower calorific value due to its lower methane content, injection timing is adapted to suit.
Seat_Mii_Ecofuel_5Despite being specifically engineered to run on CNG, the Mii Ecofuel engine can also run on unleaded petrol. With a full CNG tank (11 kg), the Mii Ecofuel has a range of up to 240 miles; the reserve petrol tank (10l) extends the range by up to 140 miles. This means that, with a full tank, a total range of up to 380 miles is possible.
Seat_Mii_Ecofuel_7A special fuel level indicator in the instrument panel informs the driver of the level in both the gas and the petrol tank. The ranges available in both operating modes are also shown in the multi-function display.
Seat_Mii_Ecofuel_6Thanks to the tidy integration of the CNG technology into the vehicle architecture, there are virtually no restrictions on use and functionality – the only difference between this and the petrol models is the absence of a spare wheel well. The connector for filling up the SEAT Mii Ecofuel at any one of the increasing number of CNG fuel stations across Europe is located beneath the same flap as the petrol cap.
Seat_Mii_Ecofuel_4The new SEAT Mii Ecofuel now makes environmentally friendly CNG technology affordable for all,” explains James Muir, President of SEAT S.A. “Its attractive starting price and exceptionally low consumption and emissions figures make the Mii Ecofuel one of the most interesting and sensible choices available – even for high-mileage drivers.

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Category: CNG, NEWS