LPG has lesser emissions than diesel vehicles, it produces 96% less NOx than diesel and 68% less NOx than petrol. LPG Gas is extensively used for domestic fuel purposes, but the introduction of LPG vehicles can make a significant impact on the environment. Being a cleaner fuel, LPG does not produce particulate matter or soot in the air.
Energy Efficiency. Propane furnaces consume less fuel than natural gas furnaces because propane has more than two times the BTUs of natural gas. Therefore, propane is a more energy-efficient fuel. A 100,000 BTU natural gas furnace burns 97 cubic feet of fuel in one hour vs. a propane furnace which burns 40 cubic feet of fuel in one hour.
Another consideration is the amount of CO2 emitted into the atmosphere by the fuel you burn. Of the three fuels discussed here, oil is by far the worst, at 161.4 lbs. of CO2 per million Btus produced. Propane is considerably better, creating 139.05 lbs. of CO2 per million Btus. Natural gas is best, at 117 lbs. of CO2 per million Btus.
Natural gas is a versatile fossil fuel that accounts for about a third of U.S. energy use. Although it produces fewer greenhouse gas emissions and other pollutants than coal or oil, natural gas is2hPcn.