Fuel compositions

1. A fuel composition comprising:

(a) a major amount of a middle distillate fuel comprising from about 0.5% to about 30% by weight fatty acid methyl esters, relative to the total amount of the fuel composition; and

(b) a minor amount of an additive composition comprising an antioxidant system comprising N,N-dimethyl cyclohexamine, at least one phenolic antioxidant, and at least one hydrocarbyl-substituted succinimide dispersant, wherein the hydrocarbyl-substituted succinimide is present in an amount ranging from about 60 ppm to about 300 ppm, and wherein the N,N-dimethyl cyclohexamine and the at least one phenolic antioxidant are present in an amount to deliver from about 20 ppm to about 100 ppm;

wherein said fuel composition demonstrates reduced sediment formation as compared to a fuel composition devoid of the additive composition.

2. The fuel composition of claim 1 , wherein the hydrocarbyl substituent of the succinimide is derived from polyisobutene having a number average molecular weight ranging from about 500 to about 5,000.

3. The fuel composition of claim 1 , wherein the hydrocarbyl-substituted succinimide is present in an amount ranging from about 60 ppm to about 200 ppm.

4. The fuel composition of claim 1 , wherein the hydrocarbyl-substituted succinimide is present in an amount ranging from about 60 ppm to about 90 ppm.

5. The fuel composition of claim 1 , wherein the phenolic antioxidant is a tertiary butyl phenol.

6. The fuel composition of claim 1 , wherein the phenolic antioxidant is a di-substituted tertiary butyl phenol.

7. The fuel composition of claim 1 , wherein the middle distillate fuel comprises from about 10% to about 20% by weight fatty acid methyl esters.

8. The fuel composition of claim 1 , further comprising at least one additive selected from the group consisting of supplementary dispersants/detergents, antioxidants, thermal stabilizers, carrier fluids, metal deactivators, dyes, markers, corrosion inhibitors, biocides, antistatic additives, drag reducing agents, friction modifiers, demulsifiers, emulsifiers, dehazers, anti-icing additives, antiknock additives, anti-valve-seat recession additives, surfactants, other lubricity additives combustion improvers, cetane number improvers, and mixtures thereof.

9. A method of reducing sediment formation in a fuel composition, said method comprising:

providing a major amount of a middle distillate fuel comprising from about 0.5% to about 30% by weight fatty acid methyl esters; and

mixing with said fuel a minor amount of an additive composition comprising an antioxidant system comprising N,N-dimethylcyclohexamine, at least one phenolic antioxidant, and at least one hydrocarbyl-substituted succinimide dispersant, wherein the hydrocarbyl-substituted succinimide is present in an amount ranging from about 60 ppm to about 300 ppm, and wherein the N,N-dimethyl cyclohexamine and the at least one phenolic antioxidant are present in an amount to deliver from about 20 ppm to about 100 ppM.

10. The method of claim 9 , wherein the hydrocarbyl-substituted succinimide is present in an amount ranging from about 60 ppm to about 200 ppm.

11. The method of claim 9 , wherein the hydrocarbyl-substituted succinimide is present in an amount ranging from about 60 ppm to about 90 ppm.

12. The method of claim 9 , wherein the phenolic antioxidant is a tertiary butyl phenol.

13. The method of claim 9 , wherein the phenolic antioxidant is a di-substituted tertiary butyl phenol.

14. The fuel composition of claim 1 , wherein the middle distillate fuel comprises from about 10% to about 20% by weight fatty acid methyl esters.

15. The method of claim 9 , further comprising mixing with said fuel at least one additive selected from the group consisting of supplementary dispersants/detergents, antioxidants, thermal stabilizers, carrier fluids, metal deactivators, dyes, markers, corrosion inhibitors, biocides, antistatic additives, drag reducing agents, friction modifiers, demulsifiers, emulsifiers, dehazers, anti-icing additives, antiknock additives, anti-valve-seat recession additives, surfactants, other lubricity additives combustion improvers, cetane number improvers, and mixtures thereof.