NOVELTY - Producing at least two hydrocarbon compositions from different biological feedstocks, comprises: (a) removing 1-10C compounds from a first biological feedstock; (b) mixing the 1-10C compounds removed in step (a) with a second biological feedstock; (c) subjecting the first biological feedstock from which the compounds have been removed to hydroprocessing in the presence of a catalyst (C1) to produce a first hydrocarbon composition; and (d) subjecting the mixture obtained in step (b) to hydroprocessing in the presence of a catalyst (C2) to produce a second hydrocarbon composition.    USE - The method is useful for producing at least two hydrocarbon compositions from different biological feedstocks, where the hydrocarbon compositions are useful for producing a fuel, which is gasoline or diesel (all claimed).    ADVANTAGE - The method: avoids wastage of the 1-10C compounds removed from the first feedstock, thus improving the overall yield as compared to a method in which these light compounds are disposed of e.g. by burning; improves efficiency of hydroprocessing since the compositions of the feedstocks are less varied following steps (a) and (b) as regards the molecular weights of their components; and provides the hydrocarbon compositions with high quality.    DETAILED DESCRIPTION - Producing at least two hydrocarbon compositions from different biological feedstocks, comprises: (a) removing 1-10C compounds from a first biological feedstock; (b) mixing the 1-10C compounds removed in step (a) with a second biological feedstock; (c) subjecting the first biological feedstock from which the compounds have been removed to hydroprocessing in the presence of a catalyst (C1) to produce a first hydrocarbon composition; and (d) subjecting the mixture obtained in step (b) to hydroprocessing in the presence of a catalyst (C2) to produce a second hydrocarbon composition, where the amount of 1-10C compounds contained in the second biological feedstock prior to step (b) is greater than the amount of 1-10C compounds contained in the first biological feedstock prior to step (a). INDEPENDENT CLAIMS are also included for:    (1) an apparatus for producing the hydrocarbon compositions from different biological feedstocks, comprising a purifier (1) for removing the 1-10C compounds from the first biological feedstock, a first feedstock inlet conduit (2) connected to the purifier for delivering the first biological feedstock to the purifier, a mixing unit (3) for mixing the 1-10C compounds removed from the first biological feedstock with the second biological feedstock, a second feedstock inlet conduit (4) connected to the mixing unit for delivering the second biological feedstock to the mixing unit, a linking conduit (5) connecting the purifier and the mixing unit for transporting the 1-10C compounds from the purifier to the mixing unit, a first hydroprocessing reactor connected directly or indirectly to the purifier, and a second hydroprocessing reactor connected directly or indirectly to the mixing unit, where the first hydroprocessing reactor is not connected to the purifier via the mixing unit, and the second hydroprocessing reactor is not connected to the mixing unit via the purifier; and    (2) a fuel comprising at least one hydrocarbon composition obtainable by the method.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the apparatus.    Purifier (1)    First feedstock inlet conduit (2)    Mixing unit (3)    Second feedstock inlet conduit (4)    Linking conduit (5)