The share of 4 cylinder engines installed in light vehicles has been increasing since 2004. Beginning in 2006, cars have shown an increase in 4 cylinder engine installations while 8 cylinder engine installations have declined during that same period. For light trucks, 6 and 8 cylinder engine installations have declined modestly while the number of 4 cylinder engines has increased markedly from 4.5% in 2004 to nearly 15% in 2009.

Engine Installations by Cylinder for Cars, 2000-2009
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Engine Installations by Cylinder for Light Trucks, 2000-2009
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Supporting Information

Light Vehicle Engine Installations by Cylinder, 2000-2009 (Percent of Total)
Cars Trucks All Light Vehicles
Year4cyl6cyl8cyl Year4cyl6cyl8cyl Year4cyl6cyl8cyl
200046.644.09.3 20007.849.640.8 200026.946.825.3
200148.842.38.9 20017.248.742.6 200127.145.626.5
200249.043.08.1 20026.450.841.9 200224.347.527.7
200349.142.88.1 20036.447.545.2 200324.645.529.4
200450.142.47.5 20044.545.248.5 200422.744.132.1
200553.539.17.4 20055.150.442.2 200524.945.827.9
200648.538.810.2 20068.047.641.6 200625.443.828.1
200752.634.67.2 20079.945.342.9 200728.440.727.5
200857.030.25.6 200810.147.540.7 200831.939.524.4
200961.924.24.9 200914.844.040.0 200937.934.322.8

Note: Only 4, 6, and 8 cylinder engines are considered in these data, though a small amount of other engines are installed.
Source: Ward's Automotive Group, Ward's Automotive Yearbook 2010.

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