
The new Volkswagen eco up! is currently the world's most fuel-efficient natural gas passenger car. The four-seat Volkswagen consumes just 2.9 kg of natural gas (CNG = Compressed Natural Gas) per 100 km; this is equivalent to CO2 emissions of just 79 g/km. This fuel efficiency leads to very low fuel costs: in Germany, the mentioned 100 km cost just over 3 euros in an eco up! that is available as a two-door or four-door; in Italy, the largest market for natural gas cars in Europe, the cost is even less than 3 euros. Today, it is not possible to drive any other all-round car this inexpensively!
Gas engines as interface to alternative energies
However, one of the greatest benefits of natural gas cars like the VW eco up! is the fact that these models are not limited to being powered by just natural gas, but can also be powered by alternative fuels such as renewable biomethane. Produced from plant by-products, biomethane does not compete with food crops; it is also CO2-neutral, because the car only emits as much carbon dioxide in combustion as it absorbed while the plants were growing. Also true: new methods for producing biomethane - such as obtaining it from straw - will further reduce dependency on classic natural gas. An example: In Germany alone, according to a study by the German Biomass Research Centre in Leipzig, up to 13 million metric tonnes of straw remain unused each year. This biomass could theoretically power four million natural gas vehicles. A first facility for producing biomethane from straw has been operating in Germany since February 2012.