This procedure incorporates a modified driving cycle replicate of consumer operation as contained and shown in SAE J1 082b (January@ 1979) and which is run on a suitable road or test track. The procedure yields cold start and 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 uniform testing procedures for measuring the cold start and warm-up fuel economy of light duty vehicles (motor vehicles designed primarily for transportation of persons and having a capacity of 12 persons or less@ or for transportation of property and rated at 6000 lb (2700 kg) or less) on suitable roads.
SAE J1256-1980 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