SUMMARYThe analysis in this paper examines the impact of reducing the excise tax on gasoline and diesel fuel on the United States economy. The analytical approach used in the analysis consists of a computable general equilibrium model composed of fourteen producing sectors, fourteen consuming sectors, six household categories classified by income and a government. The effects of a 4·3 cents per gallon reduction in the excise tax on gasoline and diesel fuel on prices and quantities are examined. The results suggest, for example, a decrease in the tax would result in higher output by the producing sectors (by about $2·86 billion), a expansion in the consumption of goods and services (by about $3·48 billion), and an increase in welfare (by about $3·59 billion). The government would realize a decrease in revenue of about $2·37 billion. When subjected to a sensitivity analysis, the results are reasonably robust with regard to the assumption of the values of the substitution elasticities.