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Truckload carrier Dart Transit Co. said it has assigned seven tractors powered by compressed natural gas to dedicated service for Andersen Window Corp.

Fleets that have embraced nitrogen tire inflation said the practice extends service life and improves fuel efficiency, but tire makers stop short of endorsing use of the gas in their products.

General Electric Co. and Chesapeake Energy Corp. have signed a three-year agreement to accelerate the adoption of natural gas.

The use of liquefied natural gas as a U.S. truck fuel has a diverse array of proponents, including President Obama, ATA Chairman Dan England, corporations such as UPS Inc. and Ryder System and environmental activists. But as of now, the super-cold fuel is hard to find.

Diesel prices continued to climb, as the national average price rose by 2.9 cents to $4.123 a gallon last week, according to the Department of Energy.

Oil rose almost $2 Friday to finish the week over $107 a barrel, on signs that the U.S. economy was rebounding, Bloomberg reported.

Diesel continued its uphill climb, rising 2.9 cents to $4.123 a gallon, its seventh straight gain and the ninth in 10 weeks, while gasoline also rose, the Department of Energy said.

This is in reference to the article “Shippers Support Trucking Industry’s Campaign to Get Congress’ OK for Longer, Heavier Vehicles.”