Q:

How much does diesel cost compared to regular unleaded gas?

A:

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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