What is the difference between diesel and gasoline fuel?

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Diesel and gasoline fuel are two primary sources of energy for automobiles. They both come from the same raw element--crude oil--but are two different types of fuel that are not interchangeable.

Making Diesel

Diesel fuel is created from crude oil. It is produced by fractional distillation, a process that separates different chemicals in crude oil and allows refineries to collect only the elements or chemicals that are needed to produce diesel fuel. This process is done by heating crude oil to between 250 degrees and 350 degrees Fahrenheit. Minor additional additives are added to finalize the fuel.

Making Gasoline

Gasoline is also created by fractional distillation. This means heating crude oil to a temperature of 35 degrees to 200 degrees Fahrenheit. This allows for the proper separation of chemicals. Like diesel, minor additional additives are usually necessary.

Engine Use

Gasoline and diesel require two different types of engines. Gas must be ignited by spark plugs, which force the piston up, giving the car power. A diesel engine does not require spark plugs because of diesel's ability to combust on its own. As it is sprayed into the engine cylinder, it combusts and moves the piston upward, creating power.

Energy Content and Efficiency

Combustible liquids contain a specific type of potential energy. Gas contains roughly 34.6 megajoules per liter. Diesel fuel surpasses gasoline in available energy per liter at 38.6 megajoules. Diesel contains 1.5 times the power of gasoline.

Price

Diesel fuel is generally more expensive than gasoline by roughly 20 cents to 30 cents per gallon, but prices vary by location.

Source:

Diffen: Diesel vs. Gasoline

U.S. Energy Information Administration: Gasoline and Diesel Fuel Update

Daily Fuel Economy Tip: What is the Difference Between Diesel and Gasoline

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What is the difference between diesel and gasoline fuel?

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