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This paper presents a statistical analysis of emission test results from over 200 light duty production vehicles ('72 to '77 models) which were purchased, maintained (in a very good state of tune), driven (on Appendix “IV” routes), and tested by the Canadian government. The results are presented as fractions of the applicable emission standard by manufacturer and by model year. Some limited data on urban fuel economy is also presented. The results would be useful in analyzing engine design policy and to assist in policy making for emission control programs for in-use vehicles.

Eighteen vehicles ranging from a 1938 Dodge to a 1965 Mustang were tested to determine their fuel economy and exhaust emissions relative to today's vehicles and today's driving conditions. The 1979 models are getting about 10% better fuel economy over the urban cycle and 20% better over the highway cycle than the older vehicles. The reasons for these differences as well as the exhaust emissions from the older vehicles are also discussed.