Gas prices at U.S. bases in South Korea are down about 11 cents a gallon this month, the second price dip in two months.

Effective Sunday, motorists at Army and Air Force Exchange Service pumps will pay $1.56 for a gallon of regular. That’s down 6.58 percent from May’s $1.67 price.

Premium is $1.75 per gallon, down 11 cents, or 5.91 percent. Diesel is $1.52 per gallon, down 9 cents, or 5.59 percent.

AAFES pegs its gas prices each month to prices in the continental United States, adjusting them with the monthly gas price averages published by the U.S. Department of Energy. AAFES adds on any dispensing costs before setting its final selling price.

In May, prices dropped about 8 cents a gallon after climbing steadily since February. Last month, the $1.67 per gallon price for unleaded was down 9 cents, or 5 percent, from April’s $1.76 price. The price of $1.86 for premium was down 8 cents, or 4 percent, from April’s $1.94 price. The diesel price of $1.61 a gallon was down 18 cents, or 10 percent.

On Friday, prices at a South Korean gas station in Seoul were $4.01 a gallon for unleaded and $2.50 per gallon for diesel.

— Choe Song-won contributed to this report.

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