Fuel composition

1. A method for combusting an organometallic compound in an automotive engine comprising;

(a) providing a fuel composition made by introducing into a fuel a synergistic combination of ingredients comprising a secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl (“MMT”), the fuel composition having a manganese treat rate ranging from about 2 mg Mn/L of fuel to about 16 mg Mn/L of fuel; and

(b) causing the fuel from (a) to be combusted in the engine,

wherein the secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of secondary organometallic compound to MMT ranging from about 5:95 to about 15:85 if the manganese treat rate ranges from about 2 mg Mn/L of fuel to 8 mg Mn/L of fuel, and further wherein the secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of secondary organometallic compound to MMT ranging from about 5:95 to about 10:90 if the manganese treat rate ranges from greater than 8 mg Mn/L of fuel to about 16 mg Mn/L of fuel;

wherein the fuel is selected from the group consisting of kerosene, low sulfur motor fuels, synthetic fuels, Fischer-Tropsch fuels, biomass to liquids (BTL) fuels, coal to liquids (CTL) fuels, gas to liquids (GTL) fuels, liquid petroleum gas, fuels derived from coal, genetically engineered biofuels, natural gas, propane, butane, unleaded motor gasolines, and reformulated gasolines,

wherein the secondary organometallic compound is cyclopentadienyl manganese tricarbonyl.

2. A method of optimizing octane performance in a fuel composition comprising blending with a hydrocarbon fuel a synergistic mixture comprising methylcyclopentadienyl manganese tricarbonyl (“MMT”) and a secondary organometallic compound, the fuel composition having a manganese treat rate ranging from about 2 mg Mn/L of fuel to about 16 mg Mn/L of fuel; wherein the fuel is selected from the group consisting of kerosene, low sulfur motor fuels, synthetic fuels, Fischer-Tropsch fuels, biomass to liquids (BTL) fuels, coal to liquids (CTL) fuels, gas to liquids (GTL) fuels, liquid petroleum gas, fuels derived from coal, genetically engineered biofuels, natural gas, propane, butane, unleaded motor gasolines, and reformulated gasolines, and further wherein the secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of secondary organometallic compound to MMT ranging from about 5:95 to about 15:85 if the manganese treat rate ranges from about 2 mg Mn/L of fuel to 8 mg Mn/L of fuel, and the secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of secondary organometallic compound to MMT ranging from about 5:95 to about 10:90 if the manganese treat rate ranges from greater than 8 mg Mn/L of fuel to about 16 mg Mn/L of fuel, wherein the secondary organometallic compound is cyclopentadienyl manganese tricarbonyl.

3. The method of claim 2 , wherein the engine is chosen from a compression ignition engine with and without catalyzed exhaust after treatment systems with OBD monitoring.

4. A method for enhancing octane number of gasoline comprising

(a) providing cyclopentadienyl manganese tricarbonyl (“CMT”) and methylcyclopentadienyl manganese tricarbonyl (“MMT”), and

(b) adding the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl to the gasoline at a manganese treat rate ranging from about 2 mg Mn/L of fuel to about 16 mg Mn/L of fuel,

wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of CMT to MMT ranging from about 5:95 to about 15:85 if the manganese treat rate ranges from about 2 mg Mn/L of fuel to 8 mg Mn/L of fuel, and further wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of CMT to MMT ranging from about 5:95 to about 10:90 if the manganese treat rate ranges from greater than 8 mg Mn/L of fuel to about 16 mg Mn/L of fuel, and

wherein the gasoline is selected from the group consisting of Fischer-Tropsch fuels, biomass to liquids (BTL) fuels, coal to liquids (CTL) fuels, gas to liquids (GTL) fuels, liquid petroleum gas, fuels derived from coal, genetically engineered biofuels, unleaded motor gasolines, and reformulated gasolines.

5. The method of claim 2 , wherein the engine is chosen from a spark ignition engine, and an advanced spark ignition engine with and without catalyzed exhaust after treatment systems with OBD monitoring.

6. A method for solubilizing cyclopentadienyl manganese tricarbonyl (“CMT”) in a hydrocarbonaceous fuel, said method comprising combining in any order cyclopentadienyl manganese tricarbonyl, methyl cyclopentadienyl manganese tricarbonyl (“MMT”), and a hydrocarbonaceous fuel at a manganese treat rate ranging from about 2 mg Mn/L of fuel to about 16 mg Mn/L of fuel, the fuel being selected from the group consisting of kerosene, low sulfur motor fuels, synthetic fuels, Fischer-Tropsch fuels, biomass to liquids (BTL) fuels, coal to liquids (CTL) fuels, gas to liquids (GTL) fuels, liquid petroleum gas, fuels derived from coal, genetically engineered biofuels, natural gas, propane, butane, unleaded motor gasolines, and reformulated gasolines,

wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of CMT to MMT ranging from about 5:95 to about 15:85 if the manganese treat rate ranges from about 2 mg Mn/L of fuel to 8 mg Mn/L of fuel, and further wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of CMT to MMT ranging from about 5:95 to about 10:90 if the manganese treat rate ranges from greater than 8 mg Mn/L of fuel to about 16 mg Mn/L of fuel, and

wherein the hydrocarbonaceous fuel does not comprise diesel or aviation fuel.

7. The method of claim 6 , wherein the cyclopentadienyl manganese tricarbonyl is added to the methyl cyclopentadienyl manganese tricarbonyl.

8. The method of claim 6 , wherein the methylcyclopentadienyl manganese tricarbonyl is added to the cyclopentadienyl manganese tricarbonyl.

9. A method for combusting an organometallic compound in a combustion system comprising;

(a) providing a fuel mixture made by introducing into a fuel a synergistic combination of ingredients comprising a secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl (“MMT”), the fuel mixture having a manganese treat rate ranging from about 2 mg Mn/L of fuel to about 16 mg Mn/L of fuel; and

(b) causing the fuel from (a) to be combusted in the combustion system;

wherein the combustion system is chosen from utility and industrial burners, boilers, furnaces, and incinerators,

wherein the secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of secondary organometallic compound to MMT ranging from about 5:95 to about 15:85 if the manganese treat rate ranges from about 2 mg Mn/L of fuel to 8 mg Mn/L of fuel, and further wherein the secondary organometallic compound and methylcyclopentadienyl manganese tricarbonyl are combined at a weight ratio of secondary organometallic compound to MMT ranging from about 5:95 to about 10:90 if the manganese treat rate ranges from greater than 8 mg Mn/L of fuel to about 16 mg Mn/L of fuel, and

wherein the fuel is selected from the group consisting of kerosene, low sulfur motor fuels, synthetic fuels, Fischer-Tropsch fuels, biomass to liquids (BTL) fuels, coal to liquids (CTL) fuels, gas to liquids (GTL) fuels, liquid petroleum gas, fuels derived from coal, genetically engineered biofuels, natural gas, propane, butane, unleaded motor gasolines, and reformulated gasolines,

wherein the secondary organometallic compound is cyclopentadienyl manganese tricarbonyl.

10. The method of claim 1 , wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined in a weight ratio of about 10:90, and further wherein the manganese treat rate ranges from about 4 mg Mn/L of fuel to about 16 mg Mn/L of fuel.

11. The method of claim 4 , wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined in a weight ratio of about 10:90, and further wherein the manganese treat rate ranges from about 4 mg Mn/L of fuel to about 16 mg Mn/L of fuel.

12. The method of claim 2 , wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined in a weight ratio of about 10:90, and further wherein the manganese treat rate ranges from about 4 mg Mn/L of fuel to about 16 mg Mn/L of fuel.

13. The method of claim 6 , wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined in a weight ratio of about 10:90, and further wherein the manganese treat rate ranges from about 4 mg Mn/L of fuel to about 16 mg Mn/L of fuel.

14. The method of claim 9 , wherein the cyclopentadienyl manganese tricarbonyl and methylcyclopentadienyl manganese tricarbonyl are combined in a weight ratio of about 10:90, and further wherein the manganese treat rate ranges from about 4 mg Mn/L of fuel to about 16 mg Mn/L of fuel.