- Diesel fuels are approximately the same as fuel oils that are used for heating, including fuel oil no. 2. All of these fuel oils comprise complex mixtures of aliphatic and aromatic hydrocarbons. These fuel oils consist of approximately 80 to 90 percent aliphatic alkanes (parraffins) and cycloalkanes (naphthenes) that are hydrogen saturated, 10 to 20 percent aromatics and 1 percent olefins.
- Diesel fuel is a liquid fuel that is used in diesel engines; it is essentially the same as fuel oil no. 2 except that it has a limited cretane number, a measurement of the quality of combustion for the diesel during the compression ignition.
- Fuel oil no. 2 is the diesel fuel that vehicles with diesel engines use for operation; it is sometimes referred to as "road diesel." It is also used for heating.
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