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July 22, 2014 10:40 AM, EDT
Diesel Declines 2.5¢ to $3.869
Daniel Acker/Bloomberg News

Diesel’s national average price fell for the third straight week and 10th time in 12 weeks, dropping 2.5 cents to $3.869 a gallon, the Department of Energy reported July 21.

The decline left diesel 3.4 cents less than the same week last year, DOE said after its weekly survey of fueling stations. The decline was the largest since a 2.6-cent drop June 9.

Gasoline, meanwhile, fell 4.2 cents to $3.593 a gallon, its lowest price since March.

Gas has dropped 11.1 cents in three straight downturns, and the motor fuel is now 8.9 cents below the same week last year.

Trucking’s main fuel had not been less than the corresponding price last year since early April, and the national average price has slipped 10.6 cents since late April, according to DOE records.

The week’s declines were led by a 3.3-cent drop in the East Coast, to $3.928, and the West Coast, generally the nation’s highest price, fell 2.6 cents to $4.026.

Each week, DOE surveys about 400 diesel filling stations and 800 gasoline stations to compile national average prices.