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The average price of U.S. retail diesel fell 6.8 cents a gallon for the final week of the year to $3.213, the U.S. Department of Energy said Dec. 29.

The price of diesel plunged 13.8 cents to $3.281 a gallon, the lowest level in four years, the Department of Energy reported Dec. 22.

Crude oil dropped to the lowest level in more than five years Dec. 18 on concern a supply glut will worsen.

The average retail price of diesel plummeted another 11.6 cents this week, sending trucking’s main fuel down to $3.419 a gallon, a low not seen in almost four years, the Department of Energy said.

West Texas Intermediate oil dropped below $60 a barrel for the first time since July 2009 as Saudi Arabia questioned the need to cut output, signaling its priority is defending market share. Brent fell to a five-year low.

As shippers of everything from toys to tools enjoy as much as $24 billion in savings from lower diesel surcharges next year, trucking companies see an opening to raise freight rates at a pace not seen in about a decade.

Retail sales in the U.S. rose in November by the most in eight months as shoppers benefited from an improving job market and cheaper fuel.

Diesel’s pump price dove 7 cents to $3.535 a gallon, the biggest drop in two years, the Department of Energy reported Dec. 8, as oil plunged to a new five-year low near $63 a barrel.