The national average price for a gallon of unleaded gasoline fell 7.9 cents to $2.637 for the week ending Aug. 24, according to federal data.

Gasoline is now 81.7 cents lower than a year ago, as it fell in nine regions tracked by the U.S. Department of Energy. The sharpest decline came in the Midwest, where the price of gallon fell 12.1 cents to $2.669. The Rocky Mountain region had the most modest fall of 1.5 cents to $2.82 on the week. Higher priced California gasoline is keeping West Coast gasoline high at $3.283 for that region.

Among states, six states now have gasoline costing at least $3 per gallon. That list is led by California at $3.474 per gallon. Others include Alaska, Nevada, Hawaii, Washington, and Illinois. On the flip side, there are 19 states with gasoline cheaper than $2.50 per gallon. South Carolina's $2.114 per gallon is the lowest on the AAA's Daily Fuel Gauge Report.

Meanwhile, the average price for a gallon of diesel fell 5.4 cents to $2.561. Diesel is now $1.26 less than a year ago.