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This paper develops and discusses the 1978-85 time trends in alternative measures of vehicle fuel economy. Nine alternative measures are presented ranging from ton-miles per gallon to menu-weighted performance adjusted miles per gallon. For each alternative measure, trends for important groups of manufacturers are presented. Ail of the trends in alternative measures are compared to the percent improvement implied by the original 1978 and 1985 passenger car average fuel economy standards (AFES).