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The national average price of diesel dropped 1.3 cents a gallon to $2.422, the Energy Information Administration reported Sept. 14. Diesel costs 56.5 cents a gallon less than it did a year ago after the second straight weekly drop.

The national average price of diesel fell by six-tenths of a cent to $2.435 a gallon, according to the Energy Information Administration. The weekly report was released Sept. 8, a day later than usual because of the Labor Day holiday.

The price of diesel jumped by 1.5 cents nationwide to $2.441 a gallon, the Energy Information Administration reported Aug. 31, as much of the nation’s oil exploration and refining capacity was shut down because of two severe-weather events.

For the second week in a row, the price of diesel remained essentially flat compared with the prior week, dipping just one-tenth of a cent to $2.426 a gallon, the Energy Information Administration reported Aug. 24.

The price of diesel remained essentially flat the past week, dipping one-tenth of a cent to $2.427 a gallon, the Energy Information Administration reported Aug. 17.

The average price of diesel increased for the first time in four weeks, inching up four-tenths of a cent nationally to $2.428 per gallon on Aug. 10, according to the Energy Information Administration’s weekly report.

Diesel fell for the third consecutive week, by three-tenths of a cent to $2.424 a gallon.

Diesel fell for the second consecutive week, by six-tenths of a cent to $2.427 a gallon from $2.433, the Energy Information Administration reported July 27.

A program meant to improve air quality by reducing diesel emissions was included in the annual defense authorization bill the Senate passed July 23.

After six consecutive weeks of increases, the national retail price of diesel fuel fell by five-tenths of a cent to $2.433 a gallon from $2.438 the previous week.