(CNN)– Gas prices are inching lower. AAA says the current national average price for a gallon of regular gasoline could reach the $3 mark for the first time in four years.

In the past week, the average has dropped more than five cents a gallon to $3.05.

In South Carolina, the average price for gas is $2.69 a gallon.

The travel agency says several factors are behind the drop including lower demand, falling crude oil prices, and a cheaper Winter-blend gas at the pump.

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