The Gould Corporation, New Business Division of Cleveland, Ohio requested confirmatory testing of a 1975 California Vega equipped with their catalyst system. The Emission Control Technology Division of the Environmental Protection Agency agreed to test the vehicle on May 6, 1975. The EPA receives information about many devices for which emission reduction or fuel economy improvement claims are made. In some cases, both claims are made for a single device. The EPA is interested in evaluating the validity of the claims for all such devices, because of the obvious benefits to the Nation of identifying devices that live up to their claims. For that reason the EPA invites proponents of such devices to provide to the EPA complete technical data on the device's principle of operation, together with test data on the device made by independent laboratories. In those cases in which review by EPA technical staff suggests that the data submitted holds promise of confirming the claims made for the device, confirmatory tests are scheduled at the EPA Emissions Laboratory. The results of all such confirmatory test projects are set forth in a series of Technology Assessment and Evaluation Reports, of which this report is one.