This report is a summary of the key trends related to the fuel economy of model year 1975 through 1999 light vehicles sold in the United States. The fuel economy values in this report are laboratory data similar to those used by the U.S. Department of Transportation(DOT) for compliance with the corporate average fuel economy standards. These laboratory values, however, are significantly higher than the estimated values used on new car labels and in the Fuel Economy Guide. Light vehicles include those vehicles that U.S. EPA and DOT classify as cars or light-duty trucks (sport utility vehicles,minivans, and pickup trucks with less than 8,500 pounds gross vehicle weight ratings).