CINCINNATI -- Gas prices vary depending on where you live, but a report released Monday showed that average prices have set a new record in Ohio and across the nation. The nationwide Lundberg Survey finds the average price of self-serve regular gasoline is a record $3.18 a gallon. That's up more than 11 cents from the last survey two weeks ago. Nationwide, the lowest average price for regular fuel is $2.87 in Charleston, S.C., and the highest is in Chicago at $3.59. AAA said that in Ohio, the cost of gas also has hit a new all-time high, averaging about $3.23 a gallon for regular. A gas price Web site showed prices ranging between $3.08 and $3.41 a gallon Prices continue to rise on concerns that U.S. refiners aren't producing enough gasoline to meet peak summer demand. BP said last week that two refineries in Indiana and Ohio were only producing 50 percent of their full capacity.