Currently, in Europe, the distribution of CNG stations is quite heterogeneous, and, certainly, the number of gas stations in each country plays a key role in driving the choice towards such kind of fuels.
Today’s CNG stations can be easily found on your navigation systems or, alternatively, the day by day evolution can be seen on the NGVA Europe website.
Refuelling a CNG car is actually really easy. Very often the receptacle (where you connect the car with the CNG fuel) is installed under the same trap together with the gasoline one.
In reality, it works just like a petrol or diesel car in the sense that you would open the little fuel door and look at how to fill the car with the fuel.