The Rolfite Company, of Stamford, Connecticut, first contacted the Emission Control Technology Division (ECTD) in the Spring of 1973 concerning a fuel additive for gasoline which they had developed and were marketing under the name of 'Upgrade'. The additive was evaluated in the Spring of 1974 by an independent testing laboratory. A test program was conducted following several suggestions from EPA which involved testing a vehicle for emissions and fuel economy at baseline conditions without the additive, at three different mileage points with the additive, and then again without the additive. Results of that program indicated significant pollutant emission reductions after Upgrade was added to the fuel and about 500 miles had been accumulated on the vehicle with the treated fuel. No significant changes in fuel economy were seen. On the basis of the emission reductions that occurred during the tests, EPA agreed to test the additive. The test program began in December 1974 and ended in March 1975.