The national average price for a gallon of unleaded gasoline fell 7.3 cents to $2.437 for the week ending Sept. 7, according to federal data.

Gasoline, which reached a Labor Day 11-year low, continue their descent and are now $1.02 less than a year ago at this time. Prices fell in nine regions tracked by the U.S. Department of Energy.

The sharpest decline for the week came in the Midwest where the price slipped 12.3 cents to $2.345. Other declines of at least 60 cents came on the West Coast ($3.091) and the West Coast not counting California ($2.789). Among the regions, the Gulf Coast now has the least expensive gas at $2.137.

California gasoline, which remained high in the spring, has also fallen. It's now the second highest state at $3.264 per gallon, according to the AAA's Daily Fuel Gauge Report. Other states with gasoline above $3 include Alaska ($3.347), Nevada ($3.101), and Hawaii ($3.029). At the other end of the spectrum, South Carolina gasoline has fallen below $2 per gallon to $1.969.

Meanwhile, the average price of diesel rose 2 cents to $2.534. Diesel is now $1.28 less than a year ago.