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After five weeks of falling prices, the national average retail price of a gallon of diesel jumped in the latest week.
For the fifth straight week, the national average retail price of a gallon of diesel dropped.
With the help of government grants, Navistar aims to develop more fuel-efficient trucks.
All regions reported price declines, ranging from 0.3 cent in New England to 3 cents in California.
All regions reported lower average prices, ranging from 2 cents in the Rocky Mountain area to 6 cents in the Central Atlantic.
After three weeks of increases, the national average retail price of a gallon of diesel fell 0.9 cent to $2.87.
Cummins, Daimler North America and Navistar will receive $115 million in fuel efficiency projects.
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