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Diesel fuel or petro-diesel is a derivative of petroleum. Diesel fuel most commonly used today is the Ultra Low Sulfur Diesel as it contains reduced amounts of sulfur in it comparatively. Petro-diesel is obtained by fractional distillation of crude oil with a boiling range of 250 ⁰C (392 ⁰F) and 350 ⁰C (662 ⁰F) at atmospheric pressure. The quality of diesel fuel is measured in terms of cetane numbers. Diesel is comparatively easier to refine from petroleum than gasoline. Diesel is mainly used as a vehicle fuel and engines using diesel are considered to be more energy efficient and have better fuel economy than for example, gasoline. Diesel is also used in gas turbines and external combustion engines.