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Because of gasoline's high energy density, your car doesn't have to carry as much fuel to travel hundreds of miles without refueling, compared to other energy sources. This makes gasoline ideal for transportation. Other fuel sources — like natural gas, coal or wind, for example — work well for use in power generation because these sources are used at a fixed location, and the electricity they generate can be effectively transmitted in large quantities from that location. To put the energy density of these sources into perspective, a pound of gasoline has almost twice the energy of a pound of coal. While natural gas has about 10% more energy per pound than gasoline, a pound of natural gas takes up much more space than a pound of gasoline. Natural gas can be compressed or liquefied to reduce its volume, but even then, it would take about 1.5 gallons of liquefied natural gas to yield the equivalent energy of a gallon of gasoline.