The national average price of a gallon of gasoline fell 1.1 cents to $2.801 for the week ending June 29, according to the U.S. Energy Information Administration.

Gasoline is now 90.3 cents less than it was a year ago, and the prices slid incrementally in seven of the nine regions tracked by the federal agency. Prices rise slightly in the Central Atlantic and Rocky Mountain regions.

Among states, Alaska has surpassed California as the nation's most expensive regular unleaded at $3.47 per gallon compared to California at $3.449 per gallon. Seven states have gasoline that costs at least $3 per gallon, while Mississippi ($2.486) and South Carolina ($2.448) gasoline cost less than $2.50 per gallon, according to AAA's Daily Fuel Gauge Report.

Meanwhile, the average price of a gallon of diesel fell 1.6 cents to $2.843 per gallon. Diesel is now $1.077 less than it was a year ago.