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A Before and After Study of the Change to Unleaded Gasoline-Test Results from EPA and Other Cycles

The University of Melbourne-Harry C. Watson, Eric E. Milkins, Steven Lansell, Ken Challenger
Published 1990-02-01 by SAE International in United States
A fleet of 50, 1986-1987 model year cars designed for unleaded gasoline has been tested on the road and on a chassis dynamometer over 5 driving cycles and a wide range of other manoeuvres including steady speeds. It was found that the fuel consumption of this fleet was 17 to 23% (depending on test cycle) less than that of a corresponding fleet to leaded fuelled cars of 1980 model year average. Exhaust emissions were significantly lowered in the range of 45 to 93%. However trend line analysis of the several data sets indicates that the ULG fleet has about 6% higher fuel consumption than would have been expected if there had been a continuing evolution of leaded vehicle technology. The data base produced has applicability to a wide range of planning and design tasks, and those illustrated indicate the effects of speed limit changes and advisory speed signs on fuel consumption and emissions.THE REDUCTION in fuel use by the Australian vehicle fleet brought about by the fuel consumption goals (similar to the CAFE in theā€¦
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