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When hydrocarbon emissions are measured for conformance testing of a vehicle's fuel and vapor handling systems, the test used is the Sealed Housing Evaporative Determination (SHED) procedure. Flame Ionization Detection (FID) techniques are used for those measurements. During development of individual fuel/emissions systems components, however, recirculation procedures described in SAE J1737 are utilized to determine emissions (adsorbancy measurements of permeation are used). The platform engineer needs a correlation between values out of both procedures and to be able to estimate the emissions of the fuel/emission system of his platform based on the lab values available for the individual components. The study was done using alcohol-containing fuels. In addition to permeation measurements for 3 different temperatures, an understanding of speciation of the fuel constituents is necessary.