The use of at one or more additives to reduce the filter blocking tendency of a fuel composition having a tendency to block filters, wherein the fuel composition comprises a renewable diesel component and a biodiesel component; and wherein the one or more additives are selected from



(a) a copolymer comprising units of formula (I):










and units of formula (II):








wherein R is an alkyl group and each of R1 and R2 is an alkyl or alkenyl group having 6 to 22 carbon atoms;



(b) the reaction product of a polycarboxylic acid having at least one tertiary amino group and a primary or secondary amine; and
(c) the reaction product of secondary amines and a copolymer of maleic anhydride and an α-olefin.