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We compare two methods for life cycle analysis: the conventional SETAC-EPA approach and Economic Input-Output Life Cycle Analysis (EIO-LCA). The methods are compared for steel versus plastic fuel tank systems and for the entire life cycle of an automobile, from materials extraction to end of life. The EIO-LCA method gives comparable results for the data common to the two methods. EIO-LCA gives more detailed data, specifies the economy wide implications, and is much quicker and less expensive to implement.