A highly combustible fuel which exhibits low exhaust pollutants is developed by exposing an atmosphere of a gaseous hydrocarbon fuel, for example, gasoline, to a source of energy such as an electrical potential difference, ultra-violet radiation, microwave radiation or laser radiation. The combustible fuel can be fed directly to the cylinders of an internal combustion engine. It is clearly visible in the flask as being whitish silvery grey in color. The combustible fuel can also be condensed and the condensate employed as a fuel.