TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The fuel composition is derived by hydrodeoxygenating and hydroisomerizing the oil in a single step. The fuel composition has at least one property (preferably density) that does not meet desired specifications, and further where the fuel composition blend exhibits improvement relative to the fuel composition in the at least one property that does not meet desired specifications in the fuel composition. The desired specifications are selected from EN590, ASTM D975, and ASTM D6751. Preferred Blend: The fuel composition blend comprises alkyl levulinate(s) of 5-40 (preferably 20-40) wt.%; comprises 2-4C alkyl levulinate(s) (0-20 wt.%) and 2-10C alkyl levulinate(s) (10-40 wt.%). Preferred Components: The alkyl levulinates are selected from ethyl levulinate, butyl levulinate, hexyl levulinate and/or higher levulinates. The alkyl levulinate(s) are produced from biomass. EXAMPLE - A mixture of the renewable diesel produced from tallow oil with butyl levulinate (15 wt.%) was prepared. The characteristics of the mixture of the renewable diesel with butyl levulinate (IB-2)/renewable diesel (I-1) were given as follows: Initial boiling point (IBP) ( degrees C): 156.3/147.3; 90% Boiling point (BP) ( degrees C): 342.1/348.7; cold filter plugging point (CFPP) ( degrees C): -16/-16; Flash point Penski-Martens ( degrees C): 61.5/57.5; Cloud point ( degrees C): -4/-8; Kinematic viscosity at 40 degrees C (cSt): 2.91/3.26; and Density (specific gravity at 15 degrees C) (g/cm3): 0.811/0.791. The IBP of the mixture increased, as compared to the renewable diesel, while the 90% boiling point (BP) of the mixture decreased, as compared to the renewable diesel. Although no effect on CFPP was recorded, the cloud point, which actually represents the phase separation, of the mixture increased, as compared to the renewable diesel. The flash point and density (specific gravity) of the mixture increased, as compared to the renewable diesel. The viscosity of the mixture decreased, as compared to the renewable diesel. The increase of IBP, flash point, and density, and decrease of 90% BP, viscosity, of the mixture, as compared to the renewable diesel, all correspond to improvements in the mixture, as compared to the renewable diesel.