NOVELTY - A fuel composition (C1) comprises liquid fuel, and nano-sized metal particles and/or nano-sized metal oxide particles (N1) (0.01-500 ppm) having spherical shape, where at least 90 wt.% of the (N1) particles have a size of 1-990 nm.    USE - As fuel composition for increasing catalytic chemical oxidation of fuel including gasoline, reformulated gasoline, oxygenated gasoline, diesel, jet fuel, marine fuel, biodiesel, bioalcohol, alcohol, or kerosene and in fuel internal combustion engines e.g. Otto-cycle engine, diesel engine, rotary engine, or gas turbine engine (claimed).    ADVANTAGE - The fuel composition (C1) has a higher Research Octane Number (RON), Motor Octane Number (MON), and/or Cetan Number (CN) than RON, MON, and/or CN as compared to a fuel composition comprising the liquid fuel but without the nanoparticles (N1). The composition (C1) improves combustion of internal combustion engine by increasing power output compared to second fuel composition without the nanoparticles; catalyzes combustion; and increases surface area where combustion occurs. The nano-sized metal (N1) particles decreases the harmful exhaust emissions and increases the catalytic chemical oxidation or combustion of hydrocarbon based fuel, thus increases the power of the engine. They provide a catalytic surface of capable of supplying oxygen to the combustion process during transient reducing atmospheric episodes generated by the combustion process and sequester low levels of water which otherwise can contaminate fuels; which decreases the sensitivity or difference between the RON and the MON levels for ethanol resulting in increasing the fuel performance when the engine is under load and can give rise to increased octane rating for the fuel. The nano-sized metal particles have a surface area and morphology suitable to catalyze the combustion reaction of fuels and to increase the rate of combustion compared to using the same amount of catalyst in bulk form. The N1 particles do not contain health hazardous and environmentally non-friendly metal and its oxides. The surfactants in the fuel composition facilitates at least one of suspending the particles within the fuel composition, preventing agglomeration, promoting compatibility between the particles and liquid fuel. The fuel composition reduces the percentage of hydrocarbons, carbon monoxide, nitrogen oxide, and molecular oxygen in motor vehicle exhaust emissions, and increases the percentage of carbon dioxide in combustion exhaust emissions.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method (M1) increasing catalytic chemical oxidation of fuel composition involving providing fuel composition (C1); and    (2) making (M2) the fuel composition involving suspending (N1) particles    .