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Canadian truckers called on their federal government to junk its plan to implement a national 2% biodiesel mandate, saying that a government study found the cost of the mandate would be nearly five times greater than the benefit.

The Obama administration was set last week to outline a path to national fuel-economy standards for large trucks, bringing industry and government officials to the White House to announce a plan that could aim at driving habits as well as equipment changes to reduce fuel use.

More than two dozen transportation advocacy groups have asked the drafters of a Senate energy and climate bill to reconsider their legislation to allocate new revenue from transportation-based motor fuel fees to “activities entirely unrelated to improving the nation’s transportation infrastructure.”

The average price of retail diesel dipped 3.3 cents to $3.094 a gallon last week, the largest decline since Feb. 1, according to the Department of Energy.

Oil prices continued to fall Wednesday, dropping under $68 a barrel a day after closing below $70 for the first time in eight months, Bloomberg reported.

The Canadian Trucking Alliance is asking that its federal government abandon a plan to adopt a 2% biodiesel mandate for all diesel fuel sold in the country.

Agents of the California Air Resources Board have fanned out to ticket truck operators who fail to comply with the state’s complicated schedule for reducing emissions from the small diesel engines that power transport refrigeration.

Two U.S. senators last week unveiled a carbon emissions reduction bill observers said would significantly increase the cost of diesel fuel.