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Diesel prices started the new year the way they ended 2014, falling 7.6 cents to $3.137 a gallon as oil prices fell below $50 a barrel for the first time in almost six years.

Oil fell for a third day, extending its drop from the lowest close since 2009, as record supplies from Iraq and Russia bolstered speculation that a global glut that drove crude into a bear market will persist.

The possibility of more Mexican trucks running in the United States is still up in the air after a recent report by the Department of Transportation’s Inspector General concluded participation in a three-year pilot program was too small to yield sufficient safety data.

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.