A fuel additive package for a spark-ignition engine comprising: a Mannich detergent including the reaction product of a hydrocarbyl-substituted phenol, one or more aldehydes, and one or more amines, wherein the Mannich detergent has the structure of Formula I: wherein R 1 is hydrogen or a C1 to C4 alkyl group, R 2 is a hydrocarbyl group having a number average molecular weight of about 500 to about 3000, R 3 is a C1 to C4 alkylene or alkenyl group, and R 4 and R 5 are, independently, hydrogen, a C1 to C12 alkyl group, or a C1 to C4 alkyl amino C1-C12 alkyl group; a quaternary ammonium salt additive having the structure of Formula II [(R 10)(R 11)N-(CH 2) n -X m -(CH 2) n -X m -(CH 2) n -N ⊕ (R 7)(R 8)(R 9)] M ⊖ (Formula II) wherein each X is a bivalent moiety selected from the group consisting of -O-, -N(R 12)-, -C -, -C O-, or -C NR 12; each R 7, R 8, and R 9 are independently alkyl groups containing 1 to 8 carbon atoms; R 10 and R 11 are independently selected from hydrogen, an alkyl group, an acyl group, or a hydrocarbyl substituted acyl group, the hydrocarbyl substituent of one or both of R 10 and R 11 having a number average molecular weight of 700 or greater; R 12 is independently a hydrogen or a group selected from C 1-6 aliphatic, phenyl, or alkylphenyl; each m is independently an integer of 0 or 1 with at least one m being 1; each n is independently an integer of 1 to 10; and M ⊖ is a carboxylate; an alkoxylated alcohol, wherein a weight ratio of the alkoxylated alcohol to the Mannich detergent is 0.8 or less, wherein the alkoxylated alcohol is a polyether having the structure of Formula Va: wherein R 6 is an aryl group or a linear, branched, or cyclic aliphatic group having 5 to 50 carbons, R 7 is a C1 to C4 alkyl group, and n is an integer from 5 to 100; wherein a weight ratio of the Mannich detergent to the quaternary ammonium salt additive is 4:1 to 10:1; and wherein the fuel additive package includes 20 to 70 weight percent of the Mannich detergent, 1 to 20 weight percent of the quaternary ammonium salt additive, and 5 to 30 weight percent of the alkoxylated alcohol. a Mannich detergent including the reaction product of a hydrocarbyl-substituted phenol, one or more aldehydes, and one or more amines, wherein the Mannich detergent has the structure of Formula I: wherein R 1 is hydrogen or a C1 to C4 alkyl group, R 2 is a hydrocarbyl group having a number average molecular weight of about 500 to about 3000, R 3 is a C1 to C4 alkylene or alkenyl group, and R 4 and R 5 are, independently, hydrogen, a C1 to C12 alkyl group, or a C1 to C4 alkyl amino C1-C12 alkyl group; a quaternary ammonium salt additive having the structure of Formula II [(R 10)(R 11)N-(CH 2) n -X m -(CH 2) n -X m -(CH 2) n -N ⊕ (R 7)(R 8)(R 9)] M ⊖ (Formula II) wherein each X is a bivalent moiety selected from the group consisting of -O-, -N(R 12)-, -C -, -C O-, or -C NR 12; each R 7, R 8, and R 9 are independently alkyl groups containing 1 to 8 carbon atoms; R 10 and R 11 are independently selected from hydrogen, an alkyl group, an acyl group, or a hydrocarbyl substituted acyl group, the hydrocarbyl substituent of one or both of R 10 and R 11 having a number average molecular weight of 700 or greater; R 12 is independently a hydrogen or a group selected from C 1-6 aliphatic, phenyl, or alkylphenyl; each m is independently an integer of 0 or 1 with at least one m being 1; each n is independently an integer of 1 to 10; and M ⊖ is a carboxylate; an alkoxylated alcohol, wherein a weight ratio of the alkoxylated alcohol to the Mannich detergent is 0.8 or less, wherein the alkoxylated alcohol is a polyether having the structure of Formula Va: wherein R 6 is an aryl group or a linear, branched, or cyclic aliphatic group having 5 to 50 carbons, R 7 is a C1 to C4 alkyl group, and n is an integer from 5 to 100; wherein a weight ratio of the Mannich detergent to the quaternary ammonium salt additive is 4:1 to 10:1; and wherein the fuel additive package includes 20 to 70 weight percent of the Mannich detergent, 1 to 20 weight percent of the quaternary ammonium salt additive, and 5 to 30 weight percent of the alkoxylated alcohol.