The national average price for a gallon of diesel tumbled 9.6 cents — its largest drop of the year — to reach $3.922,  according to Energy Information Administration data released May 8.

The national average price of diesel continued its descent, sliding 6.2 cents to $4.185 a gallon in its seventh straight decline, according to Energy Information Administration data released March 20.

The national average price for diesel slipped 3.5 cents to $4.247 a gallon, according to Energy Information Administration data released March 13.

Diesel’s national average price continued to decline, but only by a 1.2-cent dip to $4.282 a gallon, according to Energy Information Administration data released March 6.

The national average price for diesel finished February with a flourish, dropping 8.2 cents a gallon to reach $4.294, according to Energy Information Administration data released Feb. 27.

The national average price of diesel continued to dive, shedding 6.8 cents to settle at $4.376 a gallon, according to Energy Information Administration data released Feb. 21.

The national average price of diesel slid 8.3 cents to $4.539 a gallon, according to Energy Information Administration data released Feb. 6.

The national average price of diesel nudged up 1.8 cents to $4.622 a gallon, according to Energy Information Administration data released Jan. 30.

The national average price for diesel reversed its trend and climbed 8 cents to $4.604 a gallon, according to Energy Information Administration data for the week ending Jan. 23.

The national average price of diesel dipped 2.5 cents to $4.524 a gallon, according to Energy Information Administration data for the week ending Jan. 16.