Road hauliers operating natural gas for vehicles (NGV) or preparing to invest in this type of engine will find a wealth of useful information in this study (taxation, vehicle prices, support schemes, etc.). Vehicle characteristics and costs are initially expressed in ranges reflecting the diversity of offers and uses in this sector. At the end of the document, estimates of the operating cost (TCO 2025) of a long-haul LNG HGV and a regional CNG HGV are compared with those of diesel-powered articulated vehicles operating in equivalent activities.