"FIGURE S.1 Total U.S. energy use by sector, 2008 (in quadrillion Btu, or quads). For each sector, ""total energy use"" is direct (primary) fuel use plus purchased electricity plus apportioned electricity-system losses. Economy-wide, total U.S. primary energy use in 2008 was 99.4 quads. Totals may not equal sum of components due to independent rounding."
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