OXYGENATE/HYDROCARBON SHIFT WILL REWRITE GASOLINE RECIPES

This paper reports on an estimate made of reformulated gasoline component requirements for 1995 ozone and carbon monoxide (CO) attainment, as mandated by the amended Clean Air Act of 1990. The most significant change in reformulated gasoline composition will be an oxygenate-hydrocarbon shift replacing aromatics with ethers{emdash}primarily MTBE early in the decade. As the decade progresses, the trend will be toward an average fuel that combusts more completely and tends to be more stable with respect to evaporative emissions.