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Fleet managers should consider total “fluid efficiency” when comparing trucks using exhaust gas recirculation engines with those using selective catalytic reduction, truck and engine maker Navistar Inc. said last week.

President Obama signed into law a financial reform bill that includes provisions aimed at reducing speculative trading in commodities such as crude oil and diesel fuel and limiting the fees that credit-card companies can charge merchants for their services.

U.S. retail diesel prices dipped 0.4 cent last week to $2.899 a gallon, the ninth decrease in the national fuel average during the past 10 weeks, the Department of Energy reported.

The Environmental Protection Agency announced last week it wants the U.S. trucking industry to increase its use of biodiesel to 800 million gallons in 2011 from 650 million gallons this year.

Massachusetts has indefinitely suspended a mandate that was to take effect July 1 requiring all diesel fuel and heating oil sold there to be 2% biodiesel.

U.S. retail fuel prices continued their midsummer slide last week, as the average cost of a gallon of diesel dipped 2.1 cents to $2.903, and gasoline slipped 0.8 cent to $2.718, the Department of Energy reported.

Oil prices fell below $77 a barrel Wednesday following a Department of Energy report that showed diesel and gasoline inventories improved last week even though oil stockpiles declined, Bloomberg reported.

Massachusetts has indefinitely suspended a 2% biodiesel mandate for fuel and heating oil that was to take effect this month, saying that without the federal tax credit for the producers, the cost of biodiesel would be too high for consumers.