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The U.S. average retail price of diesel continued its descent for a third straight week, falling 2.4 cents a gallon to $2.421, the Department of Energy reported.

FCA US, the North American automaking unit of Fiat Chrysler Automobiles N.V., will invest $40 million to convert 179 trucks in its private fleet to run on compressed natural gas and build in Detroit the largest private CNG fueling station in North America.

Trucks in the European Union are no more fuel-efficient than they were more than a decade ago, according to a report released Dec. 3, as calls increase for emissions from heavy-duty vehicles to be regulated in the same way as cars.

While 2015 will go down as the worst year for crude train disasters, it also is shaping up to be the year crude-by-rail hit the brakes.

Depressed oil prices are likely to linger longer as analysts dropped their predictions further for next year, according to a Reuters poll, assuming OPEC will not cut output when it meets Dec. 4.

Oil headed for its largest monthly drop Nov. 30 since July as Iran signaled the Organization of Petroleum Exporting Countries won’t reduce its production target at a meeting this week.