TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compositions: The biofuel further comprises an additive to increase cetane number of the biofuel composition. The emulsified fuel further comprises thermal stabilizers, aging stabilizers, antioxidants, coloring agents, dyes, markers, odor modifying agents, rust inhibitors, inhibitors of gum formation, metal deactivators, upper cylinder lubricants, friction modifiers, detergents, bacteriostatic agents, fungicides, and/or microbiocides. Preferred Components: The cetane additive is peroxides, nitrates, nitrites, and/or nitrocarbamates, preferably optionally substituted, optionally branched less than or equal to10C alkyl or cycloalkyl nitrates or dialkyl peroxides of formula R1OOR2. The cetane additive comprises 2-ethylhexyl nitrate and/or di-tertiary-butyl peroxide. The hydroxyl-containing organic compound includes 1-4C optionally branched monoalcohols, 2-4C mono- and poly-alkylene glycols, derivatives of 2-4C mono- and poly-alkylene glycols provided that the molecular weights of such polyalkylene glycols are for use in the fuel compositions. The alcohol is comprised of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, and/or tripropylene glycol. The biofuel further comprises a supplementary low viscosity, low density combustible liquid comprising hydrocarbon solvents, paint thinner, turpentine, and/or mineral spirits.R1, R2=1-10C alkyl.Preferred Methods: Water is premixed with the components other than the vegetable oil to produce an aqueous mixture and the aqueous mixture is mixed with the vegetable oil. High shear is generated using mixing equipment capable of generating and introducing ultrasonic energy into the mixture.    TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The emulsifier exhibits hydrophilic-lipophilic balance (HLB) of 8.5-18. Preferred Compounds: The emulsifier is comprised of polyethylene glycol-polypropylene glycol block copolymers, sorbitan monooleate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, polyoxyethylene (20) sorbitan trioleate, polyethylene (20) sorbitan monooleate, and/or polyethylene (20) sorbitan monolaurate.