Energy in the United States
Final energy consumption

Transportation used 28% of energy, almost all of which was petroleum and other fuels. Half of the combustible fuels that make up the transportation sector were gasoline, and half of the vehicle usage was for cars and small trucks. Diesel and heavier trucks each made up about a quarter of their respective categories; jet fuel and aircraft were about a tenth each. Biofuels such as ethanol and biodiesel made up 5%, while natural gas was 4%. Electricity from mass transit was 0.2%; electricity for light passenger vehicles is counted in other sectors, but figures from the US Department of Energy estimate that 2.1 million electric vehicles used 6.1 TWh to travel 19 billion miles, indicating an average fuel efficiency of 3.1 miles per kWh.
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