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This paper presents the results of an experimental and analytical study of the relative flammability hazard presented by the fuel tank headspace vapours of alcohol/gasoline blends. The aim was to determine if these blends pose a greater hazard in practice than conventional gasoline fuels. Three types of experiments were conducted. The first was a flammability test performed at high and low energy levels using the Bruceton method to assign a statistical probability of ignition at different temperatures. Vapour pressure measurement and gas chromatographic analysis allowed the experimental vapour phase flammability to be determined and a mathematical model to be validated. The model was used to examine the hazard parametrically for other conditions. Even with a high alcohol content, the characteristics of the vapour are strongly influenced by the more volatile gasoline fractions.