How much does diesel cost compared to regular unleaded gas?


Quick Answer

According to the U.S. Energy Information Administration, the U.S. average price of regular unleaded gasoline for the week ending July 20, 2015, was $2.66. The average price for diesel fuel for that same week was $2.78.

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Full Answer

While both diesel fuel and gasoline are used as fuel for internal-combustion engines and derived from petroleum, gasoline requires much more refining to reach its final form. Diesel engines ignite fuel via compression rather than with a spark plug like gasoline engines. This form of combustion makes diesel engines more efficient under heavy loads and increases their longevity. Until ultra-low sulfur diesel was introduced in 2006, diesel engines were unpopular in passenger cars due to their perceived noisiness and exhaust smell.

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