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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site fuel oil A liquid petroleum product less volatile than gasoline, used as an energy source. Fuel oil includes distillate fuel oil (No. 1, No. 2, and No. 4), and residual fuel oil (No. 5 and No. 6). Related category    • FUELS Source: Energy Information Administration Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP