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5. CBO., 2003. Fuel Economy Standards Versus A Gasoline Tax. Congressional Budget Office (www.cbo.gov); available at ftp://ftp.cbo.gov/49xx/doc4917/12-24-03_CAFE.pdf. A summary report is available at ftp://ftp.cbo.gov/51xx/doc5159/03-09-CAFEbrief.pdf.