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DUBLIN, Va. — Volvo Trucks North America is laboring diligently to persuade federal and state regulators to ramp up standards on greenhouse-gas emissions in an orderly fashion so as not to scare off fleets from buying more fuel-efficient trucks that will be produced to comply with the Phase 2 rule expected later this year.

Nikola Motor Co. will display a working prototype of a 2,000 horsepower Class 8 all-electric truck “later this year,” the manufacturer said.

The U.S. retail diesel average inched up 0.5 cent to $2.271, the Department of Energy said.

The nonprofit network Business for Social Responsibility said it launched an interactive database called Fuel Tool to support the transition to low-carbon commercial road freight.

Crude traded near $45 a barrel May 8 as Canadian wildfires knocked out about 1 million barrels a day of production, outweighing the new Saudi Arabian oil minister’s pledge to maintain the country’s policy of near-record output.

The U.S. average diesel price rose for the 10th time in 11 weeks, this time by 6.8 cents a gallon to $2.266 — the highest price since just before Christmas, the Department of Energy reported May 2.

WASHINGTON — The United States is enjoying a remarkable abundance of energy choices, much of it due to hydraulic fracturing, or fracking. However, there is a growing legal and regulatory challenge to reduce the production and use of fossil fuels by limiting their extraction and transport, a lobbyist said here in a briefing for an American Trucking Associations committee.

The biggest increase in U.S. gasoline demand in almost 40 years hasn’t been enough to keep storage tanks from filling up.

The U.S. average retail diesel price rose by 6.8 cents to $2.266 a gallon, the highest level this year, the Department of Energy reported after its May 2 survey of fueling stations.

U.S. gasoline demand rose at the fastest annual rate in almost 40 years in February as stronger economic growth and cheap fuel prices spur driving in the world’s biggest oil consumer.