One of the preferred additives (A) (ii) for use in the fuel compositions of this invention are esters represented by the formula 0 ca c 1 a \m where either one of the groups R and R is an alkenyl group containing from 8 to 40 carbon atoms and the other of the groups R and R is a hydrogen atom, and R is C to C alkyl group, or the group wherein R and R are C; to C alkyl groups and R is a C to C alky