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WASHINGTON — Congressional Democrats said steps need to be taken to ensure that U.S. consumers are not getting shortchanged by “hot” fuel, but representatives of the fuel retailing industry said adjusting sales by temperature was unnecessary and would hurt small businesses.

Heavy-duty retail truck sales in the United States fell 51.7% in May from year-ago levels, the result of slowing freight demand and the impact of last year’s big pre-buy.

The U.S. heavy-duty truck fleet was about 4.8% larger at the end of the first quarter than it was in the comparable period last year, according to new data from R.K. Polk & Co.

New York City Mayor Michael Bloomberg announced a change in his congestion pricing proposal, saying trucks meeting federal engine emission standards would be charged $7 to enter Manhattan at peak times, rather than $21.

Volvo AB will invest more than $240 million to expand engine and gearbox production in Europe, Bloomberg reported Friday.

Industrial production was unchanged in May, the Federal Reserve said Friday.

U.S. consumer confidence fell this month, according to the University of Michigan’s monthly consumer sentiment index released Friday.

The American Trucking Associations, California Trucking Association and Owner-Operator Independent Drivers Association need to get together and stop the restructuring of the California ports.