LPG or liquefied petroleum gas, is a compressed mix of propane and butane gases, produced from oil. It’s also known just as propane. It is very versatile, as well as clean burning compared to other fossil fuels, and is used for heating and other home uses such as backup generators. In the US it’s used most often for cooking and barbecues, and for homes off the grid it’s a cost-efficient way to provide heat indoors. It can also be used in cars as an alternative to conventional gas – here it’s called autogas. In the US, LPG or propane accounts for about 2% of total energy use.