NOVELTY - Preparing a biodiesel product involves obtaining a triglyceride starting material containing free fatty acids (0.5-10, preferably 0.5-5)%, removing at least some of the free fatty acids by Kolbe electrolysis and transesterifying the triglyceride with 1-4C alcohol, optionally in presence of hydroxide or alkoxide catalyst, to form a product mixture including a biodiesel fraction and a crude glycerol fraction.    USE - For preparing hydrocarbon product such as biodiesel product (claimed), useful as diesel fuel, motor oil, lubricating oil or fuel additives, in diesel automobiles and trucks or blended with diesel fuel or other fuel products.    ADVANTAGE - The method provides improved biodiesel yields and glycerol in more pure form enough for use directly in glycerol ether manufacture. The method produces biodiesel fuel with higher yields than conventional processes by converting the free fatty acids (FFA) to biodiesel fuel or to hydrocarbons in the diesel range as well as by minimizing the rag layer caused by the fatty acid carboxylate salts. The formation of relatively purer glycerol by product facilitates conversion of the glycerol to glycerol ethers, which increases the overall yield of fuel from the starting triglycerides. The process can tolerate relatively high FFA concentration than traditional biodiesel processes, thus the process works well with used cooking oil with up to 15% FFA content.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) fuel product (P1) comprising number 6 oil and at least one hydrocarbon produced by the Kolbe electrolysis of fatty acid carboxylate salts; and fatty acids produced by acifidication of fatty acid carboxylate salts present in a crude glycerol fraction formed from the transesterification of fatty acid-containing triglycerides;    (2) preparing a hydrocarbon product involving obtaining a triglyceride starting material which contains free fatty acids (0.5-10%), esterifying at least a portion of the free fatty acids with isobutylene in the presence of an acid catalyst, removing or neutralizing the acid catalyst; and transesterifying the triglyceride with a 1-4C alcohol; and    (3) generating electric power involving using the fuel product (P1) to power a generator.