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The Auto Mass Benchmarking study uses the A2Mac1 vehicle tear-down database of approximately 250 model 2011-2015 vehicles and statistical regression analysis to isolate mass-efficient designs and compare lightweighting. A component structure that is identified as efficient is one that stands out statistically as much lighter than others of its kind of the same size, structural performance and material. For efficient steel, this could be due to the use of Advanced High-Strength Steels, and/or because of a fully optimized design. Fifteen individual components were analyzed and results included in the study report.