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The recent publication in Europe of vehicle fuel consumption values on standardized test procedures has made it possible to compare the over-the-road energy efficiency of vehicles designed for North America with those designed for Europe. Thirty-six of the former were tested on the three ECE fuel consumption cycles. The results indicate equal or better performance for the American technology and made it possible to calculate “one-way” factors to predict a vehicle's performance on the ECE cycles from the U.S. EPA fuel consumption data for the UDDS and HWFET cycles.