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A switch to cleaner-burning natural gas as a fuel for heavy-duty trucks could increase global warming due to the release of methane at drilling sites and the fact that natural gas-powered engines get fewer miles per gallon than traditional diesel-powered engines, according to a report issued May 19 by the Environmental Defense Fund.

Oil has the lowest share of the U.S. transportation fuel market since the 1950s, when steam trains remained a common sight on American railroads.

UPS Freight has added 64 liquefied natural gas-fueled tractors to its fleet. The tractors join UPS’ worldwide fleet of more than 2,500 natural gas-powered vehicles, the company said April 30.

Trucking and natural-gas industry witnesses told a Senate panel Dec. 3 that Congress could spur the use of the alternative fuel in the transportation sector by changing the tax code, subsidizing a fueling network and addressing existing weight restrictions on highways.

Clean Energy Fuels Corp. said it has acquired a controlling stake in the “virtual pipeline” company NG Advantage and bought its compression station in Milton, Vermont.

Questar Fueling Co. has opened a compressed natural gas station in Dallas for Frito-Lay as the company continues to convert its fleet to run on the cheaper fuel.

Matthew Godlewski has been named the new president of the advocacy group Natural Gas Vehicles for America. He will start Oct. 20.

Clean Energy said it expects to open three public natural-gas stations as Dillon Transport continues to convert its fleet to natural gas-powered trucks.

Anheuser-Busch is converting its fleet of 66 diesel trucks in Houston to compressed natural gas-powered engines.