How many CNG supplied vehicles are used in Italy?

How many CNG supplied vehicles are used in Italy?

In Italy 3,420,776 vehicles supplied by alternative fuels and propulsions are travelling, of which 926.704 (2,41) have petrol-CNG bi-fuel engine. All bi-fuel vehicles are 8,88% of national car fleet (information provided by Consorzio Ecogas study centre)