Patent ID: 8863700

Claim:
An additive concentrate for a fuel for use in a injected fuel engine comprising (a) a hydrocarbyl substituted quaternary ammonium internal salt, wherein the quaternary ammonium internal salt is substantially free of non-covalently bonded anion species and comprises a reaction product of a hydrocarbyl substituted compound containing at least one tertiary amino group and a halogen substituted C 2 -C 8 carboxylic acid, ester, amide, or salt thereof; and (b) a reaction product derived from (i) a hydrocarbyl substituted dicarboxylic acid, anhydride, or ester and (ii) an amine compound or salt thereof of the formula wherein R is selected from the group consisting of hydrogen and a hydrocarbyl group containing from about 1 to about 15 carbon atoms, and R 1 is selected from the group consisting of hydrogen and a hydrocarbyl group containing from about 1 to about 20 carbon atoms, wherein the reaction product (b) on average has less than 1 amino-triazole group per molecule, and wherein a weight ratio of (a) to (b) in the additive concentrate ranges from about 10:1 to about 1:10.