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Four California senators have called for significantly increasing state funding to curtail pollutants from trucks and buses.

A notice from the U.S. Environmental Protection Agency to revisit parts of the Phase 2 final rule on greenhouse gas emissions from heavy- and medium-duty trucks isn’t likely to create changes quickly, as the agency has not presented plans for expedited action and environmental groups are vowing to pursue a challenge in a federal appeals court — once the case is no longer being held in abeyance.

Parked east of the California Capitol steps was a long line of vehicles as clean as they were large, including a yellow school bus, a UPS delivery truck and an AC Transit bus — all with electric or hybrid motors.

Comments on a plan by the Trump administration to halt the future growth of biomass-based diesel fuel and reduce the short-term requirements for all renewable fuels were largely split down the middle, pro and con.

More than four years after an FBI raid on the headquarters of Pilot Flying J, the exhaustive investigation into a diesel fuel rebate fraud could be nearing its end come Oct. 31.

It could be years before drivers on U.S. highways catch a glimpse of a tractor-trailer rig cruising down the highway with another truck trailing a perilous 20 or 30 feet behind.

The U.S. average retail price of diesel rose 1.7 cents to $2.598 in the seventh consecutive weekly rise for trucking's main fuel.

While gasoline prices are hovering around $2 per gallon in Oklahoma, that’s not the direct cost of the fuel. State and federal taxes tally up to 35.4 cents of total gasoline cost per gallon.

Pennsylvania motorists will have an opportunity to participate in a study exploring the potential impact of a road usage tax on the East Coast.