CNG vehicles require a higher initial capital investment than diesel vehicles and involve higher maintenance costs, but the cost of CNG is lower. Fuel costs represent a significant proportion of the operating costs of heavy-duty vehicles, and therefore fuel savings from gas-powered vehicles can offset the increase in other costs and result in total cost of ownership (TCO) savings. compared to diesel vehicles, under the right conditions of CNG mileage and price.

There are a number of small compressed natural gas (CNG) filling stations in the UK that serve specific customer bases. These existing stations are predominantly for the use of HGV-type long-distance vehicles and small bus fleets. At present, the workshops in the United Kingdom that allow the large-scale conversion of urban vehicles to CNG are being implemented with little presence yet. These vehicles could include any combustion vehicle, eg garbage trucks, buses, local taxis, fleet vans.

As a general trend in all the surveys, gas vehicles obtain better results than diesel vehicles in that they are quieter than diesel vehicles, have great driving comfort, and lower polluting emissions. However, SI gas vehicles were rated worse than diesel in terms of vehicle range, a slight loss of vehicle power and also that the number of service stations available is fewer in the UK.

The price of CNG, especially Bio-CNG, is giving rise to great interest on the part of transport companies in the use of this fuel, which is generally cheaper than traditional fuels.