Material Compatibility and Durability of Vehicles with Methanol/Gasoline Grade Tertiary Butyl Alcohol Gasoline Blends

Results of compatibility studies of vehicle fuel system components and materials with gasoline containing 4.5 volume % methanol/4.5 volume % gasoline-grade tertiary-butyl alcohol are presented. Vehicles from on-the-road use over several years showed no increased corrosion of metals or deterioration of elastomers and plastics when compared to hydrocarbon-only fuels. Vehicle exhaust emissions remain unchanged or are reduced. Charcoal canisters and evaporative emissions do not appear to be differentially affected.