Natural gas in liquid form; to produce liquefied natural gas, natural gas is purified and then cooled to -260 F (-162 C). LNG is equal to 1.5 GGE, i.e. gasoline gallon equivalent (GGE), or the amount of energy in a gallon of gasoline. This means it requires 1.5 gallons of LNG to get the same amount of energy in a single gallon of gasoline.