In the late 2000s, with auto manufacturers making efforts to reduce emissions ; and increase fuel efficiency due to the high price of oil and the economic recession, the proportion of new vehicles sold in the U. S. with four-cylinder engines ( largely of the inline-four type ) rose from 30 percent to 47 percent between 2005 and 2008, particularly in mid-size vehicles where a decreasing number of buyers have chosen the V6 performance option.

In the late 2000s, with auto manufacturers making efforts to increase fuel efficiency and reduce emissions, due to the high price of oil and the economic recession, the proportion of new vehicles with inline-four engines have increased considerably at the expense of V6 and V8 engines.

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