How many LPG supplied vehicles are used in italy?

How many LPG supplied vehicles are used in italy?

In italy 3,420,776 vehicles supplied by alternative fuels and propulsions are travelling, of which 2,309,020 (5,99%) have petrol-gpl bi-fuel engine. All bi-fuel vehicles are 8,88% of national car fleet (information provided by consorzio ecogas study centre)