Fuel additive composition

A fuel additive composition comprising:

• (a) one or more copolymers comprising:
• at least one unit of formula (I) below:
• with
• u=0 or 1,
• R1′ is chosen from the group consisting of a hydrogen atom and a methyl group,
• E is chosen from the group consisting of —O—, —N(Z)—, —O—CO—, —CO—O—, —NH—CO— and —CO—NH—, with Z representing H or a C1-C6 alkyl group,
• G represents a group chosen from the group consisting of a C1-C34 alkyl, an aromatic nucleus, an aralkyl comprising at least one aromatic nucleus and at least one C1-C34 alkyl group, and
• at least one unit of formula (II) below:
• in which
• R1″ is chosen from the group consisting of a hydrogen atom and a methyl group,
• Q is chosen from the group consisting of an oxygen atom and a group —NR′— with R′ being chosen from the group consisting of a hydrogen atom and C1 to C12 hydrocarbon-based chains,
• R comprises a C1 to C34 hydrocarbon-based chain substituted with at least one quaternary ammonium group and optionally one or more hydroxyl groups, the group R also possibly containing one or more nitrogen and/or oxygen atoms and/or carbonyl groups,
• (b) one or more Mannich bases, and
• (c) at least one carrier oil.