Fuel oil.

Fuel oil, which is the residue from distilling crude oil during the refining process, refers to a range of the least volatile and heaviest of the commercially used fuels..

Ethanol.

Ethanol is produced either as a petrochemical or through the fermentation of agricultural goods such as corn, sugarcane and other crops.

Naphtha.

Naphtha refers to a range of volatile and flammable liquids produced by the distillation of petroleum.