Mixtures suitable as fuel additives

A mixture suitable as a fuel additive comprising a

• A) polyisobutyl amine in which the polyisobutyl radical has an average molecular weight of from 750 to 1500, prepared by hydroformylation of the corresponding polyolefin and amination of the resulting aldehyde and alcohol mixture under hydrogenating conditions, and
• B) at least one polyetheramine of the formula I
• where
• m is 1 or 2
• n is from 1 to 100,
• R1 is a monovalent C2-C35-hydrocarbon radical when m is 1 and
• a divalent C2-C30-hydrocarbon radical when m is 2,
• and
• R2 and R3 are each hydrogen, C1-C12-alkyl, C5-C7-cycloalkyl, C6-C10-aryl, a polyalkyleneamine radical or alkanolamine radical having from 1 to 5 nitrogen atoms, where the radicals may be identical or different and, together with the nitrogen atom to which they are bonded, may form a five-membered or six-membered ring in which further hetero atoms may be incorporated, and D is C2-C5-alkylene.