NOVELTY - An adjustable fuel power booster component composition for improving combustion performance of hydrocarbon/alcohol based fuels comprises a component (A) is an ignition accelerator chosen from e.g. normal propyl nitrate, diterbutyl peroxide, acetone peroxide and meta-nitrobenzotadecylamide; a component (B) is chosen from e.g. propylene glycol monoalkyl ether, and butylene glycol monoalkyl ether; and a component (C) is chosen from e.g. methyl carbonate and ethyl carbonate.    USE - As an adjustable fuel power booster component composition for improving combustion performance of hydrocarbon/alcohol based fuels in a standard non-modified gasoline or diesel engine (claimed).    ADVANTAGE - The composition has a high alcohol content for modified functioning with alcohols and/or fuels; increases power output and lowers toxic gas emissions when it is mixed with hydrocarbon fuels and/or low energy content alcohol based oxygenated fuels; reduces pollution and consumption; improves the cosolvency; avoids freezing and promotes the cleaning of carbonaceous deposits; exhibits good ignition enhancer; avoids modifications on conventional engines once designed for using hydrocarbon fuels air-fuel and compression ratios; improves cetane number in diesel engines and octane number in gasoline engines; allows adjustments to the ignition temperature, flame speed, level of explosivity and cetane or octane number; permits low energy content components to more be competitive on a liter to liter basis with higher energy content fuels; avoids phase separation when small amounts of water are present in the hydrocarbon fuel; produces less contaminant gas emissions; increases the octane number when used as a gasoline substitute and the cetane number when used as a diesel substitute; reduces opacity when used as diesel substitute; permits present gasoline or diesel engines used without requiring changes in engines components; works competitively with low cost, highly oxygenated fuels made from biomass; releases propylene oxide and/or butylene oxide from component at a precise moment before the combustion process occurs that helps to increase maximum pressure near to the expansion cycle start; provides thermal decomposition and releases propylene oxide and/or butylene oxide that helps to burn the remaining fuel and induces a rapid volumetric expansion of the gas that reduces the available space for the combustion of the remaining fuel; reduces the available space for the combustion of the remaining fuel produces; increases the flame propagation speed such that there is no need for lowering the ignition temperature of the components that have higher ignition temperature and a distillation curve similar to commercially available hydrocarbon fuels; has very high combustion efficiency; behaves as a co-solvent in a single phase even when, in the whole mixture, small amounts of water are present; maintains single-phase in mixtures with hydrocarbon fuels and/or alcohol based fuels and even when the fuel is exposed to high ambient moisture such as cold weather and limited water filtration; produces combustion at lower temperatures compared to conventional fuels allowing the manufacturers to use more economic and lighter cooling system; produces a colder flame when compared to conventional fuels; reduces accident risks in vehicles catching fire that allows the manufacturers to build safer engines; adjusts a larger octane number, lower opacity, and larger cetane number than pure gasoline, even when used in a mixture with gasoline and the gasoline is the main component of the mixture; enables high oxygen content fuel components to be used in larger portions when operating in conventional, non-modified engines, that helps to lower overall fuel cost; has miscible property with oxygenated fuels; allows the vehicle's tanks to be filled totally partially, or alternately with conventional fuel; generates new opportunities for biomass alternative fuels and creates ways to increase energetic independence from oil producers; reduces unemployment; increases agro-industrial activities and imports in many undeveloped countries; lowers poverty without increasing atmospheric carbon dioxide levels and contributes to avoid the global warming effect; allows the possibility of building engines with lower quality requirements, that gives manufacturers the opportunity to build engines with a lower cost, lighter, with a better weight-to-power ratio and with a lower cost cooling system.    DETAILED DESCRIPTION - An adjustable fuel power booster component composition for improving the combustion performance of hydrocarbon and/or alcohol based fuels comprises at least three components, where a component (A) is an ignition accelerator chosen from normal propyl nitrate, diterbutyl peroxide, acetone peroxide, meta-nitrobenzotadecylamide di- or triethylene glycol, dinitrate, alkyl or cycloalkyl nitrates having up to 10 carbon atoms, allyl nitrate, heptyl nitrate, 2-ethylhexyl nitrate, butyl nitrate, ethyl nitrate, amyl nitrate and isopropyl nitrate; a component (B) is chosen from propylene glycol monoalkyl ether, butylene glycol monoalkyl ether, methyloxyalcohol, ethyloxyalcohol, propoxyalcohol, butoxyalcohol (where any of the alcohols contain from 1-4 carbon atoms), polyoxypropylene glycol monoalkyl ether and polyoxybutylene glycol monoalkyl ether; and a component (C) is chosen from methyl carbonate, ethyl carbonate, propyl carbonate, and butyl carbonate mixed with methylal(dimethoxymethane) or ethylal (diethoxymethane).