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Under the auspices of the Coordinating Research Council, a program was conducted to determine the effect of gasoline/oxygenate blends on exhaust emissions (particularly carbon monoxide) for three types of emission control technologies. Tests were performed at sea level and high altitude and at temperatures of 75°F, 50°F, and 35°F. The primary fuel set consisted of a 13 psi RVP hydrocarbon-only gasoline, a hydrocarbon/11 volume percent MTBE blend, and a hydrocarbon/splash-blended 10 volume percent ethanol blend. Additionally, sea level tests were conducted with a hydrocarbon/11 volume percent ethanol matched-volatility blend and at limited conditions with a hydrocarbon/16 volume percent MTBE blend. The cars and emission control technologies tested were six 1986-88 “Adaptive Learning” closed-loop three-way catalyst systems, six 1983-86 closed-loop three-way systems without the adaptive learning capability, and four 1979-80 carbureted oxidation catalyst systems.