NOVELTY - A composition (D1) comprises a polyalkyl(meth)acrylate polymer containing at least one polymer with ethylenically unsaturated compound (I); a graft copolymer composition (B) comprising a copolymer based on ethylene as graft base (B1) and containing 60-85 wt.% of ethylene and 15-40 wt.% of a compound (A1) selected from vinyl esters, (meth)acrylates and alpha-olefins, and a polyalkyl(meth)acrylate polymer (B2) containing (I); and ethylene-based copolymer (C) comprising 80-88 mol% of ethylene (C1) and 12-20 mol% of compound (A1).    USE - In fuel oil, concentrate, middle distillate and biodiesel (claimed). Also used in diesel fuel of mineral origin, (i.e. diesel, gas oil or diesel oil), palm oil, rapeseed oil, coriander oil, soya oil, cottonseed oil, sunflower oil, castor oil, olive oil, groundnut oil, corn oil, almond oil, palm oil, palm kernel oil, coconut oil, mustard seed oil, oils which are derived from animal tallow, especially beef tallow, bone oil, fish oils and used cooking oils, oils which derive from cereal, wheat, jute, sesame, rice husks, jatropha, algae, arachis oil, tobacco oil and linseed oil.    ADVANTAGE - The composition improves the performance, especially the cold flow properties and injector nozzle coking tendency of middle distillates, especially diesel fuels, biodiesel and/or their blends and also reduces tendency of diesel injector nozzle fouling. The composition significantly reduced pour point (PP) and cold filter plugging point (CFPP) of mineral diesel, biodiesel and their mixtures better than either of the components alone or mixtures of only two of the components.    DETAILED DESCRIPTION - A composition (D1) comprises at least one polyalkyl(meth)acrylate polymer (A) containing at least one polymer with ethylenically unsaturated compound CH2(=CR)COOR-1 (I) and a diluent; at least one graft copolymer composition (B) comprising a copolymer based on ethylene as graft base (B1) and containing 60-85 wt.% of ethylene and 15-40 wt.% of a compound (A1) selected from vinyl esters, (meth)acrylates and alpha-olefins (preferably vinyl acetate and vinyl propionate) and a polyalkyl(meth)acrylate polymer (B2) containing at least one ethylenically unsaturated compound (I) and a diluent; and at least one ethylene-based copolymer composition (C) comprising 80-88 mol% of ethylene (C1), 12-20 mol% of at least one compound (A1) (preferably vinyl acetate and acrylates); and at least one diluent. The ethylene-based copolymer of composition (C) has a number average molecular weight Mn of 2000-10000 g/mol. The average carbon number of the alkyl group R1 throughout the molecule is 11-16 and in at least 60 wt.%, based on the total amount of compounds of (I) used.    R=H or CH3;    R1=1-22C linear or branched, saturated or unsaturated alkyl group (preferably 12-18C alkyl).    INDEPENDENT CLAIMS are included for the following:    (1) a fuel oil composition comprising (a) 0.001-1 wt.% (preferably 0.005-0.5 wt.%) of (D1), (b) 0-100 wt.% (preferably 0-98 wt.%) diesel fuel of mineral origin, and (c) 0-100 wt.% (preferably 2-100 wt.%) biodiesel fuel, based on the total amount of components (a), (b) and (c); and    (2) a concentrate comprising (D1) and optionally at least one fuel additive.