The average price for a gallon of diesel dropped about 4 cents for the week ending Oct. 10, according to the U.S. Energy Information Administration.

Since last week, the national average price for diesel has dropped to about $2.506 per gallon, down from $2.546. Diesel is about 64.4 cents cheaper per gallon than it was one year ago, EIA reported.

The Rocky Mountain region had the most significant decrease – 9.5 cents from last week’s average of $2.679.

West Coast region saw a 9.2-cent decrease from $2.789 to $2.697, while California on its own experienced an 8.2-cent drop to $2.751.

The Midwest no longer possesses the cheapest diesel in the nation. Gulf Coast region prices dipped to $2.446 – a 4.4-cent decrease from last week – to edge out the Midwest, which dropped 1.9 cents to $2.448.

The East Coast region reported a 3.4-cent decrease to $2.533.

In the New England region, diesel prices dropped 2.9 cents to $2.649; the Central Atlantic region reported a drop of 4 cents to $2.654; and the Lower Atlantic region closed the week at $2.471, a decrease of 3.2 cents.

The EIA report, regularly released each Monday, was released on Tuesday this week because of the Columbus Day holiday.