Hi Richard
Welcome to the forum.
You'll find heaps of useful information right throughout the forums.
A quick google (and translation) gave this result:
Important news on widening the range Ecofuel (natural gas) are discovered during a very interesting view, was an executive with Volkswagen, during which it was found that in addition to the already announced Golf Ecofuel, production in 2010 will also Tiguan Ecofuel.
Note some further research shows that some of the Ecofuel range also includes a small fuel tank for either diesel or petrol.
Info seems a bit scarce but I think you can work on CNG as being the "Ecofuel".
Make sure you share your experiences of this technology
Dash
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