We in the US use two common petropleum products that are in a gaseous state: Propane and Natural Gas. The latter is run through gas pipelines and usually deilvered in it's natural state.

When Natural Gas is pressurized (about 150 psi) it becomes liquid and is known as is known as liquefied natural gas (LNG). It is mostly methane and mostly comes from wells, usually associated with oil fields. Once it was burned-off intentionally as it was considered a nuesence. Natural gas is piped directly to industrial sites and is the most common fuel for US electricity-generating plants. There is a good supply network around the US for personal and commercial auto use. I once owned an LNG-powerd pickup truck. Gas mileage was about 65% of standard gasoline.

Propane or liquefied petroleum gas (LPG) is 90% propane and tends to come from the gasoline refining process. There are rather strict standards as to the composition of LPG as compared to LNG. I use this for cooking and it is quite hot compared to natural gas. Much of rural America has no local natural gas (again, in a gaseous form) and propane (LPG) is delivered to your home in a specially-built truck.