| abstract |
A gasoline fuel additive concentrate, a gasoline fuel containing a mixture of additives, a method of reducing wear in an engine and in a fuel supply system of a gasoline engine, and a method of improving fuel efficiency. injector. The additive concentrate includes an aromatic solvent and a mixture containing (i) N, N-bis (2-hydroxyethyl) alkylamide, (ii) 2- ((2- (bis (2-hydroxyethyl) amino) ethyl) amino) ethyl alkanoate and N- (2- (bis (2-hydroxyethyl) amino) ethyl) -N- (hydroxyethyl) alkylamide, and (iii) amides and fatty acid esters derived from a self-condensation product of diethanolamine (dea) containing al minus 3 amino groups. A weight ratio of (i) to (ii) to (iii) in the concentrate ranges from about 8: 2: 0 to about 2: 5: 3. The fuel additive mixture is substantially free of glycerin and remains fluid at temperatures down to -200C. |