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The national average price for a gallon of diesel fell 3.2 cents to $3.324 in the biggest price drop in more than 15 months, according to Energy Information Administration data released Aug. 23.

The national average price of diesel dipped eight-tenths of a cent to $3.356 a gallon, according to Energy Information Administration data released Aug. 16.

The national average price for a gallon of diesel dipped three-tenths of a cent to $3.364, according to Energy Information Administration data released Aug. 9.

The national average price for a gallon of diesel climbed 2.5 cents to $3.367, according to Energy Information Administration data released Aug. 2.

The national average price for a gallon of diesel dipped two-tenths of a cent to $3.342 a gallon, according to Energy Information Administration data released July 26.

The national average price of diesel increased six-tenths of a cent to $3.344 a gallon, the second rise of less than a penny in as many weeks, according to Energy Information Administration data released July 19.

The national average price for a gallon of diesel rose seven-tenths of a cent to $3.338 a gallon, the Energy Information Administration reported July 12.

The national average price for a gallon of diesel rose 3.1 cents to $3.331 a gallon, according to Energy Information Administration data released July 5.

The national average price for a gallon of diesel fuel remained virtually unchanged, nudging up just one-tenth of a cent to $3.287, according to Energy Information Administration data released June 21.

The national average price for a gallon of diesel rose 1.9 cents to $3.274, the Energy Information Administration reported.