Bioenergy is renewable energy increase gas mileage made available from materials derived from biological sources fuel saver. In its most narrow sense it is a synonym to biofuel, fuel derived from biological sources increase miles per gallon. In its broader sense it encompasses also biomass, the biological save gas material used as a biofuel, as well as the social, economic, scientific and technical fields associated with using biological sources for energy. There is a slight tendency of the word bioenergy being favoured in Europe compared to biofuel in North America fuel saver. An another sense is the "bioenergy healing" that means healing with human internal energy via the human energetical field, called also chakra healing fuel saver.

Although fossil fuels have their origin in ancient biomass, they are not considered biomass by the generally accepted definition because they contain carbon that has been "out" of the carbon cycle for a very long time fuel saver. Their combustion therefore disturbs the carbon dioxide save gas content in the increase gas mileage atmosphere.

Plastics from biomass, like some recently developed to dissolve fuel saver in seawater, are made the same way as petroleum-based plastics, are actually cheaper to manufacture and meet or exceed increase miles per gallon most performance standards. But they lack the save gas same water resistance fuel saver or longevity as conventional plastics.