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The U.S. average retail price of diesel rose 0.3 cent to $3.163 a gallon, the Department of Energy reported, while crude climbed to $63.14, the highest level in almost three weeks amid opposing supply-and-demand signals.

The U.S. average retail price of diesel climbed 0.2 cent to $3.171 a gallon, as crude oil prices settled below $63 amid international tensions, the Department of Energy reported May 6.

The U.S. average retail price of diesel climbed 2.9 cents to $3.147 a gallon, and crude oil prices pushed past $65 a barrel to post a six-month high, the Department of Energy reported April 22.

The looming adoption of a mandate that will require maritime vessels to burn cleaner fuel is projected to put upward pressure on diesel prices next year, but transportation experts are more concerned about how the change will affect the supply of diesel fuel for trucks.

President Donald Trump resumed his attacks on OPEC, saying the world is too fragile to handle a price hike and urging the cartel to “relax and take it easy.”

The U.S. average retail price of diesel increased ever so slightly the week of Feb. 4, rising to $2.966 a gallon, one-tenth of a cent higher than last week.

As fleets know, many variables can affect test results for truck fuel-saving technologies and practices.

The U.S. average retail price of diesel dropped 1.1 cents to $2.965 a gallon for the week of Jan. 21, despite an increase in crude oil prices to $53 per barrel, or $3 higher than a week before.