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Fährt mit Gas und Benzin, und schaltet automatisch zwischen beiden um: Der VW Passat TSI Ecofuel.

Continues with gas and gasoline, and switches automatically between the two: The VW Passat TSI Ecofuel .

DÜSSELDORF. In principle , the decision for a gas car , best for one that can also travel with gasoline , easy. It can only be expected , right? We took as an example now the Volkswagen Passat TSI Ecofuel before – as a sample calculation and practical experience with natural gas.

In market natural gas and liquefied petroleum gas as an economical and environmentally friendly fuels struggle. It has LPG – a mixture of butane and propane – the nose at the gas station density significantly forward. LPG is available in Germany at the time about 6,000 gas stations, natural gas is only 1.000, which we gained the impression that LPG is also home to the highways , more natural gas in the center , often with the energy suppliers.

It does not frighten , because the range is our Passat Trendline Ecofuel in the equipment from rich , because it both from the gas tank as well as from a – smaller – petrol tank can draw energy. If the under floor mounted gas tanks empty, the motor turns imperceptibly to the gasoline . For longer trips you should still plan the fuel stops in advance.

Who wants to take advantage of low gas prices should plan a fuel stop every 400 km . Help navigating the Internet and , if one is on board. Particularly easy life is with a natural gas vehicle course, if you live near a gas station, covers only short to medium distances per day and can then fill up again.

The "normal "four- cylinder gasoline engine has an output of 150 hp and a maximum torque of 220 Newton meters, the gas engine is at this from just 1,500 rpm to 4,500 rpm. For the early maximum , an additional compressor, which helps to bridge the turbo lag of the turbocharger .

Nevertheless, we put in the gas as in gasoline set a clear starting weakness that feels like the second before the memorial of a diesel engine revving . compensate for this performance, with acceleration from 0 to 100 km / h in 9.8 seconds and a top speed of 210 km / h. Nothing is to be felt by the weakness , which was said to old gas-powered .

Der Gasantrieb kann sich nach einer Fahrleistung von rund 50.000 Kilometern amortisiert haben.

The gas engine may have paid for itself after a mileage of 50,000 kilometers.

The standard values are given for the consumption of Volkswagen with an average of 4.5 kilograms of natural gas , or 7.2 liters of premium gasoline, according to 123 grams of carbon dioxide per km for petrol or 166 g CO2 per kilometer . In practice, we used 6.5 kilograms of gas or 9.1 gallons of gasoline per 100 km.

At this point begins the arithmetic operation : One kilogram of gas costs around one euro, the 100 km that is 6.50 euros. A liter of premium is € 1.45 . 100 km costs about 13 € . Calculated over the thick thumb gas costs you half. In the extensive model and engine range there is not really comparable with the Ecofuel Variant type.

So we can only appreciate once again come and thereby to the conclusion that the gas conversion on the Passat costs about 3000 € . If one takes into account changing gas and petrol , then one can assume that the gas drive has paid off within a mileage 40000-50000 miles.

The difference in price for gasoline is explained by the increased technical effort, going far beyond the tank . Gasoline lubricates and cools the engine in addition , gas is not , and the pressures in the combustion chamber are higher. So have valves , piston rings and pistons are additionally hardened or strengthened. In addition, a smaller turbocharger is used, supplemented by the compressor, and specific gas – injection nozzles must be installed.

There remains the issue of security : The steel tanks are crash tested . Electromagnetic valves when the motor stops immediately interrupt the gas supply. And refueling is not a problem when you have once the "threshold overcome fear . "

Data: VW Passat TSI Ecofuel

Length x width x height ( m) : 4.77 x 1.82 x 1.76
Engine: Four-cylinder petrol engine , 13.90 cc , direct injection , exhaust turbocharger , supercharger
Performance: 110 kW / 150 hp at 5,500 rpm
Max torque : 220 Nm 1500-4500 rpm
Kerb weight / payload : 1602 kg / 498 kg
Maximum permissible trailer load : 1.500 kg
Average fuel consumption (according to EU standard ): 4.5 kg of gas , 7.2 liters of premium
Emissions : gas 123 g / km , Petrol 166 g / km , € 5
Maximum speed: 210 km / h
Acceleration 0-100 km / h: 9.8 s
Strike price: € 30 525

Source: ampnet / sm