The national average price for a gallon of regular unleaded increased 1 cent to $2.42 during the week and is now 13 cents higher than a month ago and 29 cents higher than a year ago, according to AAA.

Prices have reached a 2017 high ahead of the summer travel season when driving demand increases with prices at the pump. AAA expects prices to continue to rise in the coming weeks. U.S. gasoline deliveries in March were the second highest March on record, according to the American Petroleum Institute.

The nation’s least expensive states include South Carolina ($2.12), Oklahoma ($2.15), Mississippi ($2.17), Tennessee ($2.17), Arkansas ($2.17), Alabama ($2.18), Louisiana ($2.20), Missouri ($2.22), Virginia ($2.23) and Texas ($2.26).

The states with the largest weekly increases include Utah (9 cents), Ohio (7 cents), Idaho (5 cents), Alaska (5 cents), Massachusetts (4 cents), Connecticut (4 cents), Indiana (4 cents), New Hampshire (4 cents), Rhode Island (4 cents) and Florida (4 cents).

Meanwhile, the average price of a gallon of diesel fell two-tenths of a cent to $2.595. Diesel is now 39.7 cents higher than a year ago.