Four Cylinder Engine Installations Continue to Rise
October 4, 2010
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

Engine Installations by Cylinder for Light Trucks, 2000-2009

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.