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RIO DE JANEIRO — The president of Brazilian state oil company Petrobras resigned June 1, the latest fallout from a crippling truckers’ strike over fuel prices that has widespread implications for the future of Latin America’s largest economy.

Carrier Pitt Ohio is testing two natural gas-powered Mack Anthem models equipped with Cummins Westport ISX12N engines as it seeks to use alternative fuels to reduce emissions.

The Federal Highway Administration has withdrawn its rule that would have required state departments of transportation and metropolitan planning organizations to report year-over-year changes in carbon dioxide emissions on U.S. interstates and major highways.

The Canadian office of Environment and Climate Change published a final rule on greenhouse gas regulations pertaining to heavy-duty trucks and engines in Part 2 of the Gazette on May 30.

A trucking industry-related coalition is engaged in a behind-the-scenes skirmish with two dozen Republican members of Congress over whether the Environmental Protection Agency should be required to conduct a regulatory impact analysis to support the agency’s proposal to repeal an Obama administration rule limiting the manufacture of glider kits.

Missouri voters will choose whether to raise the nation’s fourth-lowest gasoline tax when they go to the polls in November.

The California Air Resources Board has approved amendments to toughen state standards on heavy truck smoke opacity limits as well as require motor carriers with two or more trucks to report their annual smoke test results to the agency.

The U.S. average retail price of diesel increased for the 10th week in a row, nudging up 1.1 cents to $3.288 a gallon, according to the U.S. Department of Energy’s Energy Information Administration report May 28.

More fleets are requesting downsped engines that run at about 1,100 rpm at highway speeds, significantly slower than previous generations of diesels.