TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The maximum content of benzene is 1% and maximum vapor pressure is 1 bar. The aromatic amine is of formula (I). The aromatic amine is 2-fluoroaniline; 2-chloroaniline; N-methylaniline; o-toluidine; o-ethylaniline; N-methyl-o-toluidine; 2,4-dimethylaniline; 2,3-dimethylaniline; 2,5-dimethylaniline; 2,6-dimethylaniline; N-methyl-2,4-dimethylaniline; N-nitrosodiphenylamine; N-methyl-2,3-dimethylaniline; N-methyl-2,6-dimethylaniline; N-ethylaniline; N-phenylaniline; N-propylaniline; N-isopropylaniline; N-isobutylaniline; N-t-butylaniline; N-isoamylaniline; 2-methyl-3-fluoroaniline; 2-fluoro-3-methylaniline; 2-methyl-4-fluoroaniline; 2-fluoro-4-methylaniline; 2,5-dimethyl-3-fluoroaniline; 2,5-dimethyl-4-fluoroaniline; 2,3-dimethyl-6-fluoroaniline; 2-fluoro-3-ethylaniline; 2-ethyl-4-fluoroaniline; 2-methyl-5-ethyl-4-fluoroaniline; 2-fluoro-6-isopropylaniline; 2-isopropyl-3-fluoro-5-ethylaniline; 2,6-di-t-butyl-4-fluoroaniline; N-nitrosodiphenylamine; N,N-dimethyl-p-phenylenediamine; and/or N,N-diethyl-p-phenylenediamine. The low octane number product is a blend comprising low octane number fractions; a blend comprising butane gases, light straight-run gasoline, 5C isomerate, 6C isomerate, and/or gasoline reformed with different degree of severity, in which the end gasoline comprises gasoline from alkylation process, light gasoline from cracking process, or oxygenated components introduced or produced in the same refinery; or preferably straight-run gasoline (virgin naphtha or light naphtha) or natural gasoline (condensate) derived from hydrocarbons, liquid at ambient temperature, present in petroleum gas, extracted directly at the mouth of oil well. The gasoline supplemented with aromatic amine is unleaded gasoline for use in motor drives managed by electronic system, Euro III, Euro IV and Euro V; and has research octane number (RON) of 90-105, motor octane number (MON) of 80-95, sulfur content of 0-10 mg/kg, oxidation stability of 360-580 minutes according to EN ISO 7536, existent gum content of 1-5 mg/kg according to EN ISO 6246, aromatic hydrocarbon content of 5-35 vol.%, olefinic hydrocarbon content of 0-18 vol.%, benzene content of 0.1-1 vol.%, oxygen content of 0.01-3.5 vol.%, methanol content of 0-3 vol.%, ethanol content of 0-10 vol.%, isopropyl alcohol content of 0-10 vol.%, isobutyl alcohol content of 0-10 vol.%, t-butyl alcohol content of 0-7 vol.%, greater than or equal to 5C ether content of 0-15 vol.%, and other oxygenated compound content of 0-10 vol.%.R1, R2=H; or Me, Et, n-propyl, isopropyl, n-butyl, t-butyl, N2O, phenyl, or phenyl-substituted group;R3, R4=H, F, Cl, Me, Et, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, NH2, amino-(1-5C alkyl)-substituted group, or amino-aryl-substituted group; andn=0-2.Provided that, R3 is not hydrogen when n is 0. EXAMPLE - Straight-run gasoline having research octane number (RON) of 85-90 was supplemented with 2,4-dimethylaniline (0.25 vol.%/RON). Results showed 1-point increase of RON. To confirm the result, check test with 2,4-dimethylaniline was performed. A simulated base blend of gasoline comprising (vol.%) isomerate (41.5), platformate (55.5) and condensate (3) and having RON of 94.30 and vapor pressure of 0.530 bar was used. Upon addition of 2,4-dimethylaniline (0.80 vol.% or 4 ml in 500 ml), RON was increased to 97.10 and vapor pressure was decreased to 0.517 bar.