The wider flammable limits of methanol compared to unleaded gasoline impose additional safety concerns when storing nearly neat methanol fuels. The upper flammable limit temperatures (UFLT) of various methano1/gasoline fuels were determined. An excellent correlation between the UFLT of methanol/gasoline mixtures and their dry Reid vapor pressures (RVP) was obtained. It is now possible to predict the upper temperature limit of the flammability range of methano1/unleaded gasoline fuels from a knowledge of their dry RVPs.The lower flammable limit temperatures were also determined. A good correlation was obtained between the lower flammable limit temperature and the dry RVP.