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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.

An all-electric, weatherized chassis dynamometer has been built utilizing solid state control circuits. The facility allows operation up to 120 mph and can handle all passenger cars (front or rear wheel drive) and single drive axle truck units. Air conditioning allows operation from 40 F up with humidity control as well. Unique instrumentation allows digital readout of all important variables.