The use of NGT (natural gas technology) at Mercedes-Benz underlines the possibilities presented by alternative fuels. The primary focus is on an innovative drive system operated with both natural gas and petrol. The driver can switch between the two drive systems according to requirements. In doing so, power and torque remain unchanged. The only values to fall are emission figures, engine noise and consumption costs. In city traffic, for example, CO2 output is reduced by up to 15%. And a kilogramme of natural gas is around half the price of a litre of petrol. Another practical side effect: the natural gas tank extends the absolute operating range. NGT is used in the B-Class 180 NGT BlueEFFICIENCY.