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The U.S. average retail price of diesel fell 0.7 cent to $2.532 a gallon and crude oil prices extended a bumpy monthlong slide in prices, dropping below $48 a barrel, experts said.

Oil producers pledged to consider extending their pact limiting supply, as half a dozen nations said more time was needed to drain swollen stockpiles.

COLUMBUS, Ind. — Nikola Motor Co. is in discussion with the three largest truck stop operators to offer hydrogen fuel and, separately, with seven states interested in being home to its production facility as it prepares to launch in mid-2020 its zero emissions, hydrogen-electric Class 8 truck, a company executive said.

President Trump is making good on his promise to approve the Keystone XL oil pipeline — but the fight is far from over.

Oil was little changed before a meeting between OPEC and its allies that may signal the outlook for extending their output curbs.

Rep. Peter DeFazio (D-Ore.) introduced a transportation infrastructure bill on March 22 that he said will increase the gasoline and diesel tax by about a penny to provide about $500 billion in funding to rebuild U.S. roads, bridges and transit systems.

The U.S. average retail price of diesel declined 2.5 cents to $2.539 a gallon, according to the Energy Information Administration of the Department of Energy.

Oil fell as U.S. drilling continued to rise, undermining the potential for even an extended OPEC output-reduction deal to rebalance the market.

The diesel engines built this year are more efficient as the second step of greenhouse-gas Phase 1 standards takes effect. These power plants also offer improved reliability, advanced engineering, reduced maintenance and performance improvements that fleet managers and truck drivers will notice, industry experts said.

Dozens of U.S. cities are willing to buy $10 billion of electric cars and trucks to show skeptical automakers there’s demand for low-emission vehicles, just as President Trump seeks to review pollution standards the industry opposes.