NOVELTY - Fuel composition comprises a ring-hydrogenated alkyl furfuryl ether (I) or a mixture of the ethers, optionally in combination with other oxygenated compounds derived from furan and optionally in combination with diesel fuels of petroleum origin or diesel fuels of bioorganic origin.    USE - As fuel composition useful as fuel or fuel additive; as aviation fuel or aviation fuel additive; and as fuel compositions for aviation fuel purposes (claimed).    ADVANTAGE - Unlike the products resulting from mineral oil, the biomass derived furans are very high in unsaturation. This enables the use of these compounds as a cheap hydrogen storage medium, without the challenging hydrogen release requirement. Both the hydrogen as well as the furan storage host can be used as an economic fuel. Moreover, the biomass derived fuel components meet the requirements concerning flash point and freeze point maximum whilst providing a high energy density. Thus, the new fuel components are uniquely suitable for use as aviation fuel.    DETAILED DESCRIPTION - Fuel composition comprises a ring-hydrogenated alkyl furfuryl ether of formula R1-TF-CH2-O-R (I) or a mixture of the ethers, optionally in combination with other oxygenated compounds derived from furan and optionally in combination with diesel fuels of petroleum origin or diesel fuels of bioorganic origin.    TF=a 2,5-substituted tetrahydrofuran ring;    R=1-20C hydrocarbyl group;    R1=methyl, hydroxymethyl, the product of an aldol condensation reaction or an alkoxymethyl group of formula CH2-OR';and    R'=1-20C hydrocarbyl group.    INDEPENDENT CLAIMS are included for the following:    (1) new hydrogenated alkyl furfuryl ether of formula A1-TF-CH2-O-R1a or a mixture of the ethers, where if A1 is a hydroxymethyl group or a methoxymethyl group, R1a is a 2-20C hydrocarbyl group;    (2) process for preparing (I) or a mixture of the ethers; and    (3) method for energetically enriching fuel compositions comprising oxygenated compounds derived from furan comprising a 5-alkoxymethylfurfural of formula R'-O-CH2-F1-CH=O (III) or a 2,5-bis(dialkoxymethyl)furan of formula R'-O-CH2-F1-CH2-O-R1 (IV) and the fuel is enriched by storing additional hydrogen by hydrogenating the 5-alkoxymethylfurfural and/or 2,5-bis(dialkoxymethyl)furan.    F1=a 2,5-disubstituted furan ring;    R1a=1-20C alkyl;    A1=H, methyl, hydroxymethyl, the product of an aldol condensation reaction or an alkoxymethyl group of formula CH2-OR'';and    R''=1-20C alkyl.