The national average price for a gallon of regular gasoline increased 2 cents to $2.41, which marked a 2-cent increase on the week and a high-water mark for 2017, reports AAA.

The price point is now 12 cents higher tan a month ago and 30 cents higher than a year ago. Prices typically increase in the spring as refiners shift to a summer blend that impacts the East Coast region. Pump prices increased in 43 states and Washington, D.C.

The 10 least expensive markets include South Carolina ($2.13), Mississippi ($2.17), Tennessee ($2.18), Alabama ($2.18), Arkansas ($2.18), Oklahoma ($2.18) Missouri ($2.19), Louisiana ($2.21), Kansas ($2.23), and Virginia ($2.23).

The 10 markets with the largest monthly increases include Indiana (18 cents), Texas (18 cents), Michigan (17 cents), Kentucky (17 cents), Ohio (16 cents), Illinois (16 cents), Florida (15 cents), Wisconsin (15 cents), Colorado (15 cents) and Delaware (14 cents).

Meanwhile, the average price for a gallon of diesel increased 1.5 cents to $2.597. Diesel is now 43.2 cents higher than a year ago.