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The U.S. average retail price of diesel dropped 3.5 cents to $2.489 a gallon, while the stubborn glut of crude caused oil prices to tumble to about $43 a barrel — a range last seen in early August — and into a bear market, experts said.

The U.S. average retail price of diesel dropped 3.5 cents to $2.489 a gallon, while the stubborn glut of crude caused oil prices to tumble to about $43 a barrel — a range last seen in early August — and into a bear market, experts said.

The U.S. average retail price of diesel dropped 3.5 cents to $2.489 a gallon, while the stubborn glut of crude caused oil prices to tumble to about $43 a barrel — a range last seen in early August — and into a bear market, experts said.

The U.S. average retail price of diesel dropped 4 cents to $2.524 a gallon, while crude oil prices remained below $47 a barrel.

U.S. diesel and gasoline prices each made modest moves during the week ended June 5 but in different directions. Diesel slipped 0.7 cent a gallon and gas rose 0.8 cent, while crude oil dropped toward this year’s low point below $46 a barrel.

Along with increasing its diesel tax by 10 cents, Indiana recently approved a 10-cent increase to a surcharge tax for trucks.

INDIANAPOLIS — Diesel fuel dominates the commercial truck world today and will continue to do so in the near future, but greenhouse gas regulations will force the industry to use it more efficiently and eventually could push fleets toward other, cleaner fuels, industry executives said here at the Green Truck Summit.

The newest heavy-duty truck set to operate at the Port of Los Angeles emits an unusual byproduct that California could certainly use more of: water.