The Alternative Motor Fuels Act of 1988, Pub. L. 100-94, October 14, 1988, (AMFA) provides Corporate Average Fuel Economy (CAFE) incentives for the manufacture of vehicles that use alcohol or natural gas fuels, either exclusively or as an alternative fuel in conjunction with gasoline or diesel fuel. AMFA directs the Secretary of Transportation, in consultation with the Environmental Protection Agency Administrator and the Secretary of Energy, to conduct a study and submit a report to Congress evaluating the success of the policy decision to offer CAFE credit incentives for the production and sale of dual-fuel vehicles. As required by the statutory language, this study evaluates: (1) the availability to the public of alternative fuel vehicles and alternative fuels; (2) energy conservation and security; (3) environmental considerations; and (4) other relevant factors. It is also required that the Department of Transportation either extend the incentive program for dual-fuel vehicles up to four years beyond model year 2004, with a maximum allowable increase in average fuel economy per manufacturer of 0.9 miles per gallon (the maximum through MY 2004 is 1.2 miles per gallon); or issue a Federal Register notice that explains why the incentive program was not extended. This study indicates that the AMFA CAFE credit incentive program for producing dual-fuel vehicles has had mixed results.