MOTOR FUEL COMPOSITION COMPRISING A MIXTURE OF HYDROCARBONS IN THE GASOLINE BOILING RANGE CONTAINING A NITROKETONIZED AMIDE CORRESPONDING TO THE FORMULA:

R-N(-R'')-(CH2)3-NH-R"

WHERE R, R'' OR R" IS A NITRODETONIZED GROUP HAVING FROM 4 TO 40 CARBON ATOMS. THE NITROKETONIZED AMIDE PROVIDES THE FUEL COMPOSITION WITH SUCH PROPERTIES AS RUST PROTECTION, CARBURETOR DE-ICING AND CARBURETOR DETERGENCY.