The national average price for on-highway diesel has come down by 10 cents in the past two weeks. The U.S. Energy Information Administration reported the average at $3.956, down 4.8 cents for the week ending Monday, May 21.

The national average is down nearly 21 cents from where it was a year ago.

The New England region experienced a 6-cent drop in average price for the week, and even California saw a decrease of nearly 5 cents per gallon.

Following are the regional averages as reported by the EIA on Monday:

• U.S. – $3.956, down 4.8 cents
• East Coast – $3.999, down 5.5 cents
• New England – $4.130, down 6.2 cents
• Central Atlantic – $4.079, down 5.6 cents
• Lower Atlantic – $3.916, down 5.3 cents
• Midwest – $3.854, down 4.3 cents
• Gulf Coast – $3.861, down 5.4 cents
• Rocky Mountain – $3.987, down 1.7 cents
• West Coast – $4.233, down 4.4 cents
• West Coast less California – $4.152, down 4 cents
• California – $4.303, down 4.6 cents

ProMiles reported the national average at $3.95, down seven-tenths of a cent. ProMiles tracks prices daily in the continental U.S.

Missouri had the cheapest tax-included fuel at $3.68, while Washington state topped the list at $4.408.

Domestic futures for light sweet crude oil, the type most commonly associated with diesel production, were at $92.71 on Monday, up $1.23 from Friday trading in New York but down considerably from the past few months.

European Brent crude oil was a on a slight rebound Monday as well, trading at $108.77 a barrel.