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U.S. retail diesel prices set a record for the third consecutive week as the national average rose 3.4 cents a gallon to $4.177, according to data from the Department of Energy.

U.S. retail fuel prices continued to soar into uncharted territory last week, as the average price of diesel jumped another 8.4 cents to $4.143 a gallon and gasoline gained 11.9 cents to $3.508, the Department of Energy reported.

Sen. Olympia Snowe (R-Maine) has introduced legislation to lower the federal tax on diesel fuel, to make it on par with the gasoline tax.

Retail diesel surged 10.4 cents to $4.059 a gallon, the first time the national average price has crossed above $4, the Department of Energy reported. Also last week, both the U.S. gasoline average and crude oil prices set new records.

I want to know why diesel is so much more expensive than gasoline. Diesel is a byproduct of gasoline. It should be cheaper.

Nearly 90% of the biodiesel available for sale in the United States meets the established standards for quality, an improvement over past surveys but still an unacceptable situation for trucking, a new report by the Department of Energy said.