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The Environmental Protection Agency has proposed for the first time sharp cuts in exhaust emissions from railroad locomotive and marine engines in a plan a spokesman said would “follow exactly the same pattern” as environmental regulations for truck engines.

The average national price of diesel fuel jumped 7.5 cents to $2.626 a gallon, while gasoline soared 12.2 cents from last week to $2.505, the Department of Energy said Monday.

Retail diesel fuel’s national average price rose for a fourth straight week, jumping 6 cents to $2.551 a gallon, the Department of Energy said Monday.

Gasoline prices jumped almost 13 cents a gallon nationwide in the past two weeks, as the price of crude oil rose, according to the latest Lundberg Survey of filling stations, released Sunday.

UNIVERSAL CITY, Calif. — An official with the Chicago Climate Exchange said the demand for cleaner engines and alternative fuels in the United States will increase as membership in its cap-and-trade emission trading system expands.

The average national retail price of diesel fuel rose 1.5 cents to $2.491 a gallon, the Energy Department reported Tuesday.

ARLINGTON, Va. — The new chairman of the Senate Finance Committee told directors of American Trucking Associations last week that he supported creation of federal financial incentives to help fleets purchase new, cleaner-burning diesel engines and auxiliary power units.

ARLINGTON, Va. — American Trucking Associations said last week it would become more vocal in its support for increased fuel efficiency in heavy trucks and ratified an agreement with the biodiesel industry to promote that fuel at the federal level.

For anyone who operates a commercial truck, there is little doubt about the importance of the vehicle’s fuel efficiency — especially in this era of historically high diesel and gasoline prices.