The national average price for diesel fell for the sixth week in a row for the week ending Dec. 5, according to the Energy Information Administration.

The average dropped 5.4 cents to $2.425 per gallon, the lowest price since mid-August.

The lowest prices were found in the Lower Atlantic region, at an average of $2.354 per gallon. The Central Atlantic and New England regions were significantly higher, at $2.569 and $2.591 per gallon, respectively. The East Coast as a whole had an average of $2.428 per gallon.

All of those prices are down from the week before.

The Rocky Mountain region saw the biggest drop, falling 12 cents to $2.471 per gallon. California also saw a significant plunge, dipping more than 7 cents to $2.486 per gallon.

The rest of the West Coast posted an average price of $2.538 per gallon, while the Gulf Coast region came in at $2.411 per gallon.

The Midwest , meanwhile, saw an average price of $2.39 per gallon.