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A program was conducted to evaluate the performance characteristics and to determine cost effectiveness relationships associated with various prototype gasoline vapor control systems for service stations. Eight participating petroleum companies provided test facilities employing the direct displacement vapor control concept for evaluation during the summer, fall, and winter seasons. Test results indicated that the direct displacement systems had the potential for controlling approximately 95% of the vapors that normally are emitted when a tank truck delivers fuel to the underground tank and when tight connections at the vehicle fill neck are obtained. One petroleum company provided a refrigerated-condensation vapor control system for evaluation which exhibited the potential for virtually 100 percent vapor control, again when tight connections at the vehicle fill pipe could be achieved.

Background of the Pure Oil performance trials on six classes of automobiles is presented and the evolution of test requirements described. Three tests are run: the economy test to establish how far a vehicle can go over a prescribed course on one gallon of gasoline; the acceleration test which determines acceleration time from 25 to 70 mph in seconds; and the braking test where stopping distance in feet is measured for a stop from 60 mph. Each test is described from the point of view of rules, recording instruments, and penalties for infractions of rules. Test results are presented.