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In page Corporate average fuel economy:

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Proponents of higher CAFE standards also argue that the quality of the engineering design is the prime determinant of vehicular safety, not the vehicle's mass.[citation needed] In 2006, IIHS found that some of the smallest cars have good crash safety, and others do not.[6] A 2003 Transportation Research Board study show greater safety disparities among vehicles of differing price, country of origin, and quality than among vehicles of different size and weight.[7]: 17–21  A 2006 study discounts the importance of vehicle mass to traffic safety, pointing instead to the quality of engineering design as the primary factor.[8]