This procedure is a modification of the urban driving cycles noted in SAE J1082 and which is run on a suitable road or test track. The procedure yields cold start/warm-up fuel economy values indicative of consumer level at the ambient condition of the test. Within referenced limitations@ the procedure can be utilized to determine the fuel economy differential among vehicles or between vehicle changes. PURPOSE: This recommended practice provides a uniform test procedure for measuring the fuel economy of light duty vehicles during cold start and warm-up operation (motor vehicles designed primarily for transportation of persons or property and rated at 10 000 lb GVW (4500 kg) or less on suitable roads.
SAE J1256-1988 history
2002SAE J1256-2002 Fuel Economy Measurement - Road Test Procedure - Cold Start and Warm-Up Fuel Economy
1995SAE J1256-1995 Fuel Economy Measurement - Road Test Procedure - Cold Start and Warm-Up Fuel Economy@ Recommended Practice
1988SAE J1256-1988 Fuel Economy Measurement - Road Test Procedure - Cold Start and Warm-Up Fuel Economy
1980SAE J1256-1980 Fuel Economy Measurement - Road Test Procedure - Cold Start and Warm-Up Fuel Economy
1979SAE J1256-1979 Fuel Economy Measurement Road Test Procedure - Cold Start and Warm-Up Fuel Economy