TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The step of contacting with hydrogen under catalytic hydroprocessing conditions results in both hydrotreating and hydrocracking reactions. The hydroprocessed biofuel is a hydroprocessed diesel biofuel or a hydroprocessed aviation biofuel, where the method further comprises fractionating a hydroprocessed product of the contacting of the fatty acid or triglyceride-containing component and the paraffin-rich component with hydrogen to recover the hydroprocessed diesel biofuel. The method further comprises: feeding a hydrogen-containing stripping gas into a hot high pressure separator to selectively separate the hydroprocessed product into an overhead portion exiting the hot high pressure separator; generating, from at least a portion of the 4C-hydrocarbons, at least a portion of the hydrogen for contacting with the fatty acid- or triglyceride-containing component and the paraffin-rich component; catalytically reforming at least the portion of the 4C- hydrocarbons in the presence of steam to generate at least the portion of the hydrogen for contacting with the fatty acid- or triglyceride-containing component and the paraffin-rich component; and blending the hydroprocessed diesel biofuel fraction with 30-99 wt.% of a petroleum derived diesel fuel. Preferred Process: In the process, a per-pass conversion of hydrocarbons in the second reaction zone is less than 50%. The process further comprises recycling, to the first reaction zone, a bottoms portion exiting the hot high pressure product stripper and comprising at least 90 wt.% of 16C+ hydrocarbons, where the bottoms portion is combined with the hydroprocessing feedstock prior to contacting with hydrogen in step (a). Preferred Components: The paraffin-rich component is obtained from a combination of gasification and Fischer-Tropsch synthesis. The paraffin-rich component comprises olefinic hydrocarbons and oxygenated compounds. The paraffin-rich component is derived from biomass comprising hardwood, softwood, hardwood bark, softwood bark, corn fiber, corn stover, sugar cane bagasse, switchgrass, Miscanthus, algae, waste paper, construction waste, demolition waste, and/or municipal waste. The fatty acid or triglyceride-containing component is obtained from animal fat and/or plant-derived oil. The fatty acid or triglyceride-containing component comprises 5-25 wt.% of oxygen. The hydroprocessed biofuel is a hydroprocessed aviation biofuel and the hydroprocessed product comprises less than 10% of the 16C hydrocarbons entering the separator as an effluent from a hydroprocessing reactor. The hydroprocessed diesel biofuel is recovered from lower boiling hydrocarbons present in the hydroprocessed product. The lower boiling hydrocarbons comprise 4C- hydrocarbons. EXAMPLE - No suitable example given.