The national average price of a gallon of unleaded gasoline fell six cents to $2.277 per gallon for the week ending Oct. 19, according to the U.S. Department of Energy.

Gasoline now costs 84.3 cents less than it did a year ago, and the price fell in nine regions tracked by the department's Energy Information Administration.

Among the regions, the price fell more sharply in the Midwest, which saw a 10.5-cent decline to $2.30 per gallon. The mildest decline came in the Central Atlantic region with a 1.1-cent decline to $2.224.

Among states, five states now have gasoline that costs at least $2.50 per gallon, including Hawaii ($2.896), California ($2.884), Nevada ($2.824), Alaska ($2.628), and Utah ($2.513). Also, six states now have gasoline costing less than $2 per gallon, including South Carolina ($1.936), New Jersey ($1.97), Mississippi ($1.977), Alabama ($1.982), and Louisiana ($1.996).

Meanwhile, the price of diesel fell 2.5 cents to $2.531 per gallon. Diesel now costs $1.125 cents less than it did a year ago.