Indiana is heading into the Memorial Day weekend tied with California for the largest gas price increase in the U.S. over the past year.

According to American Automobile Association, AAA, Indiana has felt the biggest increase in gas prices – about 66 cents a gallon -- since the beginning of the year.

Two Illinois refineries were shut down last week for repair, and that will lead to higher prices at the pump for Hoosier drivers.

Hoosiers get a lot of their gasoline from Northwest Indiana’s Whiting Refinery and from facilities in Illinois, but a portion also comes from the Gulf Coast.

Indiana residents were paying an average of $2.61 per gallon for regular unleaded while the national average stands at $2.38.

AAA estimates that cheaper gas prices have saved Americans more than $115 billion on gasoline so far this year, which works out to more than $550 per licensed driver.

Gas prices have hit their lowest point in nearly a year. And Indianapolis has the lowest average per-gallon price anywhere in the country.

Increased Midwest refinery production and the falling price of crude oil has Hoosiers paying less at the pump.