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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.”

Fuel prices are again big news, as the national average for a gallon of retail diesel climbed to almost $4.10, well above that strong $4-a-gallon psychological threshold.

MOUNT HOLLY, N.C. — President Obama proposed a federal tax credit designed to encourage the trucking industry to move toward natural-gas and electric vehicles by helping underwrite their higher acquisition costs.

Retail diesel prices advanced an additional 4.3 cents a gallon to a national average of $4.094 last week, a level not seen in 10 months, the U.S. Department of Energy reported.