NOVELTY - Production (M1) of a biofuel involves: extracting triglycerides from roasted coffee; and tranesterifying the triglycerides.    USE - For production of a biofuel used in biofuel mixture; for production of biofuel from spent coffee from several sources e.g. several sources are selected from grocery store, convenience store, coffee shop, business, restaurant or residence (all claimed); in cosmetics, medicinal products, food products or combustible materials; as compost material, compost or fertilizer; as additives in cosmetic and other personal care product e.g. moisturizing creams and lotions, lip balms, body scrubs, sunscreens and suntan lotions; in ingestible products e.g. foods, beverages, and oral delivery such as tablets, pills, capsules, troches and lozenges.    ADVANTAGE - The method produces biofuel which is stable for more than 24 hours; is transportable; and has improved quality. The method removes nitrogen containing compounds such as caffeins and other material from coffee to obtain cleaner biofuel; uses spent grounds which obviate roasting, grinding and water-extracting the coffee, thus potentially produces biofuel at a lower cost with simpler processing; uses griding to provide a higher surface area material which increases the efficiency of oil extraction from coffee, thus improving biofuel yield; collects spent coffee grounds which provide numerous advantages in the biofuel production system and using spent coffee grounds saves such coffee grounds from taking up space in landfills or being dumped into drains and also provides useful products; uses spent coffee grounds which eliminates or reduces the need to perform others processes of the system, such as roasting, grinding, and water extraction; and spent grounds facilitate triglyceride removal, as the brewing process may precondition triglycerides for removal. The preconditioning reduces the time needed to extract the triglycerides, reduces the extraction temperature, utilizes less solvent, thus provides a higher triglyceride yield. The produced biofuel is dispensed at or near the site of production to help to reduce transportation costs.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a biofuel mixture produced by mixing an amount of a fuel prepared by method (M1) with a second fuel (f1);    (2) production (M2) of biofuel involving: either roasting coffee beans, grinding the coffee beans, extracting the coffee beans with water to produce water extracted coffee; extracting triglycerides from the water extracted coffee, and transesterifying the triglycerides to produce a coffee biofuel; or obtaining spent coffee grounds, extracting triglycerides from the spent coffee grounds and transesterifying the triglycerides to produce a coffee biofuel;    (3) a system for making biofuel comprising: triglyceride extraction unit, where the triglyceride extraction unit comprises a dry distillation unit or solvent extraction unit; transesterification unit; and solvent recovery unit;    (4) production (M3) of biofuel from spent coffee involving: either process (p1) by obtaining spent coffee grounds from several sources, transporting the spent coffee grounds to a biofuel production facility, extracting triglycerides from the spent coffee grounds and transesterifying the spent coffee grounds to produce biofuel; or process (p2) by obtaining spent coffee grounds from at least one source, and producing biofuel from the spent coffee, by extracting triglycerides from the spent coffee grounds and transesterifying the spent coffee grounds to produce biofuel; and    (5) extraction (M4) of free fatty acids from triglycerides involving: washing a triglyceride mixture comprising free fatty acids with a solvent, where the free fatty acids are extracted by the solvent, and separating the solvent from the remaining triglyceride mixture.