NOVELTY - Fuel composition comprises a major portion of an alcohol blended gasoline comprising (i) at least one alcohol at 5-90% and (ii) gasoline at 95-10%; and a minor portion of a corrosion inhibitor formulation comprising (a) a corrosion inhibitor comprising a reaction product of a monosaturated fatty acid and an azomethine compound derived from a condensation reaction between a carbonyl compound and an amine compound, (b) a fatty acid oil or ester, (c) a dispersing agent, and (d) a viscosity reducing agent.    USE - The fuel composition is useful for: the internal combustion engines; and preventing corrosion of metallurgies including carbon steel, copper, brass, lead and zinc, involved in fuel storage tanks, vehicles fuel tanks during transportation, and fuel distribution systems (all claimed).    ADVANTAGE - The composition: does not have any adverse effect on fuel quality; does not change or alter any of the properties of fuel; and is completely miscible in gasohol fuel composition, and effective against a variety of alcohol fuels.    DETAILED DESCRIPTION - Fuel composition comprises a major portion of an alcohol blended gasoline comprising (i) at least one alcohol comprising ethanol, butanol, and methanol at 5-90% and (ii) gasoline at 95-10%; and a minor portion of a corrosion inhibitor formulation comprising (a) a corrosion inhibitor comprising a reaction product of a monosaturated fatty acid, and an azomethine compound derived from a condensation reaction between a carbonyl compound and an amine compound, (b) a fatty acid oil or ester comprising castor oil, palm oil, soyabean oil, methyl soya ester, (c) a dispersing agent, where the dispersing agent is a sulfonate compound, and (d) a viscosity reducing agent comprising ethanol, isopropanol, and propargyl alcohol. INDEPENDENT CLAIMS are included for:    (1) a corrosion inhibitor comprising a reaction product of monosaturated fatty acid and an azomethine compound derived from a condensation reaction between a carbonyl compound and an amine compound in the ratio of 1:1-2:1; and    (2) preparing a corrosion inhibitor formulation, comprising: obtaining a reaction product of a monosaturated fatty acid and an azomethine compound derived from a condensation reaction between a carbonyl compound and an amine compound to give a corrosion inhibitor; dissolving the corrosion inhibitor in a fatty acid oil or ester, where the fatty acid oil or ester is castor oil, palm oil, soyabean oil, or methyl soya ester; adding a dispersing agent, where the dispersing agent is a sulfonate compound; and adding a viscosity reducing agent to give the corrosion inhibitor formulation, where the viscosity reducing agent is ethanol, isopropanol, or propargyl alcohol.